diff --git a/ChangeLog b/ChangeLog
index d9b3c8de..28b7e46c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,10 @@
-2015-09-22  Markus Gans  <guru.mail@muenster.de>
+2015-09-24  Markus Gans  <guru.mail@muenster.de>
+	* Add macro _METHOD_CALLBACK and _FUNCTION_CALLBACK 
+	  to simplify the use callback functions
+	* The callback data pointer is now predefined with 
+	  NULL as default argument
+
+2015-09-23  Markus Gans  <guru.mail@muenster.de>
 	* Further code optimizations
 
 2015-09-22  Markus Gans  <guru.mail@muenster.de>
diff --git a/src/fbuttongroup.cpp b/src/fbuttongroup.cpp
index a63dc7d6..ae991fcd 100644
--- a/src/fbuttongroup.cpp
+++ b/src/fbuttongroup.cpp
@@ -298,9 +298,7 @@ void FButtonGroup::insert(FToggleButton* button)
   button->addCallback
   (
     "toggled",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&FButtonGroup::cb_buttonToggled),
-    null
+    _METHOD_CALLBACK (this, &FButtonGroup::cb_buttonToggled)
   );
 }
 
diff --git a/src/ffiledialog.cpp b/src/ffiledialog.cpp
index 4d7d5e0e..eb961969 100644
--- a/src/ffiledialog.cpp
+++ b/src/ffiledialog.cpp
@@ -148,44 +148,32 @@ void FFileDialog::init()
   filename->addCallback
   (
     "activate",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&FFileDialog::cb_processActivate),
-    null
+    _METHOD_CALLBACK (this, &FFileDialog::cb_processActivate)
   );
   filebrowser->addCallback
   (
     "row-changed",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&FFileDialog::cb_processRowChanged),
-    null
+    _METHOD_CALLBACK (this, &FFileDialog::cb_processRowChanged)
   );
   filebrowser->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&FFileDialog::cb_processClicked),
-    null
+    _METHOD_CALLBACK (this, &FFileDialog::cb_processClicked)
   );
   hidden->addCallback
   (
     "toggled",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&FFileDialog::cb_processShowHidden),
-    null
+    _METHOD_CALLBACK (this, &FFileDialog::cb_processShowHidden)
   );
   cancel->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&FFileDialog::cb_processCancel),
-    null
+    _METHOD_CALLBACK (this, &FFileDialog::cb_processCancel)
   );
   open->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&FFileDialog::cb_processOpen),
-    null
+    _METHOD_CALLBACK (this, &FFileDialog::cb_processOpen)
   );
   setModal();
   setTransparentShadow();
diff --git a/src/flabel.cpp b/src/flabel.cpp
index f22967d3..d37ddf1d 100644
--- a/src/flabel.cpp
+++ b/src/flabel.cpp
@@ -377,9 +377,7 @@ void FLabel::setAccelWidget (FWidget* widget)
   accel_widget->addCallback
   (
     "destroy",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&FLabel::cb_accel_widget_destroyed),
-    null
+    _METHOD_CALLBACK (this, &FLabel::cb_accel_widget_destroyed)
   );
 }
 
diff --git a/src/flistbox.cpp b/src/flistbox.cpp
index a8b9a901..72d4bc15 100644
--- a/src/flistbox.cpp
+++ b/src/flistbox.cpp
@@ -115,16 +115,12 @@ void FListBox::init()
   VBar->addCallback
   (
     "change-value",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&FListBox::cb_VBarChange),
-    null
+    _METHOD_CALLBACK (this, &FListBox::cb_VBarChange)
   );
   HBar->addCallback
   (
     "change-value",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&FListBox::cb_HBarChange),
-    null
+    _METHOD_CALLBACK (this, &FListBox::cb_HBarChange)
   );
 }
 
diff --git a/src/fmenuitem.cpp b/src/fmenuitem.cpp
index a778e1af..8630d9d1 100644
--- a/src/fmenuitem.cpp
+++ b/src/fmenuitem.cpp
@@ -99,9 +99,7 @@ void FMenuItem::init (FWidget* parent)
       this->addCallback
       (
         "activate",
-        (FWidget*)superMenu(),
-        reinterpret_cast<FWidget::FMemberCallback>(&FMenuBar::cb_item_activated),
-        null
+        _METHOD_CALLBACK (superMenu(), &FMenu::cb_menuitem_activated)
       );
     }
     else if ( isMenu(parent) ) // Parent is menu
@@ -114,9 +112,7 @@ void FMenuItem::init (FWidget* parent)
       this->addCallback
       (
         "activate",
-        (FWidget*)superMenu(),
-        reinterpret_cast<FWidget::FMemberCallback>(&FMenu::cb_menuitem_activated),
-        null
+        _METHOD_CALLBACK (superMenu(), &FMenu::cb_menuitem_activated)
       );
     }
   }
diff --git a/src/fmessagebox.cpp b/src/fmessagebox.cpp
index 1375a02f..7ebbe6cc 100644
--- a/src/fmessagebox.cpp
+++ b/src/fmessagebox.cpp
@@ -160,8 +160,7 @@ void FMessageBox::init(int button0, int button1, int button2)
     button[0]->addCallback
     (
       "clicked",
-      this,
-      reinterpret_cast<FWidget::FMemberCallback>(&FMessageBox::cb_processClick),
+      _METHOD_CALLBACK (this, &FMessageBox::cb_processClick),
       static_cast<FWidget::data_ptr>(button_digit[0])
     );
 
@@ -170,8 +169,7 @@ void FMessageBox::init(int button0, int button1, int button2)
     button[1]->addCallback
     (
       "clicked",
-      this,
-      reinterpret_cast<FWidget::FMemberCallback>(&FMessageBox::cb_processClick),
+      _METHOD_CALLBACK (this, &FMessageBox::cb_processClick),
       static_cast<FWidget::data_ptr>(button_digit[1])
     );
 
@@ -179,8 +177,7 @@ void FMessageBox::init(int button0, int button1, int button2)
     button[2]->addCallback
     (
       "clicked",
-      this,
-      reinterpret_cast<FWidget::FMemberCallback>(&FMessageBox::cb_processClick),
+      _METHOD_CALLBACK (this, &FMessageBox::cb_processClick),
       static_cast<FWidget::data_ptr>(button_digit[2])
     );
 
diff --git a/src/fstatusbar.cpp b/src/fstatusbar.cpp
index de4d4447..d5f130eb 100644
--- a/src/fstatusbar.cpp
+++ b/src/fstatusbar.cpp
@@ -626,9 +626,7 @@ void FStatusBar::insert (FStatusKey* skey)
   skey->addCallback
   (
     "activate",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&FStatusBar::cb_statuskey_activated),
-    null
+    _METHOD_CALLBACK (this, &FStatusBar::cb_statuskey_activated)
   );
 }
 
diff --git a/src/ftextview.cpp b/src/ftextview.cpp
index eaea0aa5..962ed5de 100644
--- a/src/ftextview.cpp
+++ b/src/ftextview.cpp
@@ -53,16 +53,12 @@ void FTextView::init()
   VBar->addCallback
   (
     "change-value",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&FTextView::cb_VBarChange),
-    null
+    _METHOD_CALLBACK (this, &FTextView::cb_VBarChange)
   );
   HBar->addCallback
   (
     "change-value",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&FTextView::cb_HBarChange),
-    null
+    _METHOD_CALLBACK (this, &FTextView::cb_HBarChange)
   );
 }
 
diff --git a/src/fwidget.h b/src/fwidget.h
index 82e16448..51043390 100644
--- a/src/fwidget.h
+++ b/src/fwidget.h
@@ -17,6 +17,14 @@
 #define FLAT          0x00000080
 #define NO_UNDERLINE  0x00000100
 
+// Callback macros
+#define _FUNCTION_CALLBACK(h) \
+           reinterpret_cast<FWidget::FCallback>((h))
+
+#define _METHOD_CALLBACK(i,h) \
+           reinterpret_cast<FWidget*>((i)) \
+         , reinterpret_cast<FWidget::FMemberCallback>((h))
+
 class FStatusBar;
 class FMenuBar;
 
@@ -268,8 +276,13 @@ class FWidget : public FObject, public FTerm
    void           clearStatusbarMessage();
    FString        getStatusbarMessage();
 
-   void           addCallback (FString, FCallback, void*);
-   void           addCallback (FString, FWidget*, FMemberCallback, void*);
+   void           addCallback ( FString
+                              , FCallback
+                              , void* data = null );
+   void           addCallback ( FString
+                              , FWidget*
+                              , FMemberCallback
+                              , void* data = null );
    void           delCallback (FCallback);
    void           delCallback (FWidget*);
    void           emitCallback (FString);
diff --git a/test/calculator.cpp b/test/calculator.cpp
index a06f4913..4826b88e 100644
--- a/test/calculator.cpp
+++ b/test/calculator.cpp
@@ -259,8 +259,7 @@ Calc::Calc (FWidget* parent)
     btn->addCallback
     (
       "clicked",
-      this,
-      reinterpret_cast<FWidget::FMemberCallback>(&Calc::cb_buttonClicked),
+      _METHOD_CALLBACK (this, &Calc::cb_buttonClicked),
       &button_no[key]
     );
 
diff --git a/test/dialog.cpp b/test/dialog.cpp
index aeb2f8f9..0493bd51 100644
--- a/test/dialog.cpp
+++ b/test/dialog.cpp
@@ -56,7 +56,7 @@ int main (int argc, char* argv[])
   btn.addCallback
   (
     "clicked",
-    reinterpret_cast<FWidget::FCallback>(&cb_quit),
+    _FUNCTION_CALLBACK (&cb_quit),
     &app
   );
 
diff --git a/test/input-dialog.cpp b/test/input-dialog.cpp
index bf1cc2ac..a47243fe 100644
--- a/test/input-dialog.cpp
+++ b/test/input-dialog.cpp
@@ -109,7 +109,7 @@ int main (int argc, char* argv[])
   check1->addCallback
   (
     "clicked",
-    reinterpret_cast<FWidget::FCallback>(&cb_publish),
+    _FUNCTION_CALLBACK (&cb_publish),
     check2
   );
 
@@ -117,7 +117,7 @@ int main (int argc, char* argv[])
   btn.addCallback
   (
     "clicked",
-    reinterpret_cast<FWidget::FCallback>(&cb_quit),
+    _FUNCTION_CALLBACK (&cb_quit),
     &app
   );
 
diff --git a/test/ui.cpp b/test/ui.cpp
index 4dbd7245..966f0f77 100644
--- a/test/ui.cpp
+++ b/test/ui.cpp
@@ -14,6 +14,10 @@
 
 class ProgressDialog : public FDialog
 {
+ private:
+   ProgressDialog (const ProgressDialog&);    // Disabled copy constructor
+   ProgressDialog& operator = (const ProgressDialog&); // and operator '='
+
  public:
    FButton* reset;
    FButton* more;
@@ -33,7 +37,12 @@ class ProgressDialog : public FDialog
 #pragma pack(pop)
 
 //----------------------------------------------------------------------
-ProgressDialog::ProgressDialog (FWidget* parent) : FDialog(parent)
+ProgressDialog::ProgressDialog (FWidget* parent)
+  : FDialog(parent)
+  , reset()
+  , more()
+  , quit()
+  , progressBar()
 {
   setGeometry (int((this->parentWidget()->getWidth()-40)/2), 7, 40, 10);
   setText("Progress bar");
@@ -66,25 +75,19 @@ ProgressDialog::ProgressDialog (FWidget* parent) : FDialog(parent)
   reset->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&ProgressDialog::cb_reset_bar),
-    null
+    _METHOD_CALLBACK (this, &ProgressDialog::cb_reset_bar)
   );
 
   more->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&ProgressDialog::cb_more_bar),
-    null
+    _METHOD_CALLBACK (this, &ProgressDialog::cb_more_bar)
   );
 
   quit->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&ProgressDialog::cb_exit_bar),
-    null
+    _METHOD_CALLBACK (this, &ProgressDialog::cb_exit_bar)
   );
 }
 
@@ -143,7 +146,7 @@ void ProgressDialog::cb_more_bar (FWidget*, void*)
 //----------------------------------------------------------------------
 void ProgressDialog::cb_exit_bar (FWidget*, void*)
 {
-  this->close();
+  close();
 }
 
 
@@ -158,6 +161,11 @@ class MyDialog : public FDialog
 {
  private:
    FListBox* myList;
+
+ private:
+   MyDialog (const MyDialog&);    // Disabled copy constructor
+   MyDialog& operator = (const MyDialog&); // and operator '='
+
  public:
    explicit MyDialog (FWidget* parent=0);  // constructor
   ~MyDialog();  // destructor
@@ -179,8 +187,29 @@ class MyDialog : public FDialog
 #pragma pack(pop)
 
 //----------------------------------------------------------------------
-MyDialog::MyDialog (FWidget* parent) : FDialog(parent)
+MyDialog::MyDialog (FWidget* parent)
+  : FDialog(parent)
+  , myList()
 {
+/* This Code is working in progress...
+ 
+  FMenuBar* menubar = new FMenuBar(this);
+  FMenu* file       = new FMenu("&File", menubar);
+  FMenu* edit       = new FMenu("&Edit", menubar);
+
+  FMenuItem* open   = new FMenuItem("&Open", file);
+  FMenuItem* quit   = new FMenuItem("&Quit", file);
+
+  FMenuItem* cut    = new FMenuItem("Cu&t", edit);
+  FMenuItem* copy   = new FMenuItem("&Copy", edit);
+  FMenuItem* paste  = new FMenuItem("&Paste", edit);
+
+  quit->addCallback
+  (
+    "clicked",
+    _METHOD_CALLBACK (this, &MyDialog::cb_exitApp)
+  );
+*/
   FButton* MyButton1 = new FButton(this);
   MyButton1->setGeometry(3, 3, 5, 1);
   MyButton1->setText(L"&SIN");
@@ -302,133 +331,109 @@ MyDialog::MyDialog (FWidget* parent) : FDialog(parent)
   MyButton1->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&MyDialog::cb_noFunctionMsg),
-    null
+    _METHOD_CALLBACK (this, &MyDialog::cb_noFunctionMsg)
   );
 
   MyButton2->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&MyDialog::cb_noFunctionMsg),
-    null
+    _METHOD_CALLBACK (this, &MyDialog::cb_noFunctionMsg)
   );
 
   MyButton3->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&MyDialog::cb_noFunctionMsg),
-    null
+    _METHOD_CALLBACK (this, &MyDialog::cb_noFunctionMsg)
   );
 
   MyButton4->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&MyDialog::cb_ProgressBar),
-    null
+    _METHOD_CALLBACK (this, &MyDialog::cb_ProgressBar)
   );
 
   MyButton5->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&MyDialog::cb_info),
-    null
+    _METHOD_CALLBACK (this, &MyDialog::cb_info)
   );
 
   MyButton6->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&MyDialog::cb_input2buttonText),
+    _METHOD_CALLBACK (this, &MyDialog::cb_input2buttonText),
     dynamic_cast<FWidget::data_ptr>(MyLineEdit)
   );
 
   MyButton7->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&MyDialog::cb_exitApp),
-    null
+    _METHOD_CALLBACK (this, &MyDialog::cb_exitApp)
   );
 
   MyLineEdit->addCallback
   (
     "activate",  // e.g. on <Enter>
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&MyDialog::cb_setTitlebar),
-    null
+    _METHOD_CALLBACK (this, &MyDialog::cb_setTitlebar)
   );
 
   radio1->addCallback
   (
     "toggled",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&MyDialog::cb_activateButton),
+    _METHOD_CALLBACK (this, &MyDialog::cb_activateButton),
     dynamic_cast<FWidget::data_ptr>(MyButton4)
   );
 
   myList->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&MyDialog::cb_setInput),
+    _METHOD_CALLBACK (this, &MyDialog::cb_setInput),
     dynamic_cast<FWidget::data_ptr>(MyLineEdit)
   );
 
   myList->addCallback
   (
     "row-selected",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&MyDialog::cb_updateNumber),
+    _METHOD_CALLBACK (this, &MyDialog::cb_updateNumber),
     dynamic_cast<FWidget::data_ptr>(tagged_count)
   );
 
   key_F1->addCallback
   (
     "activate",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&MyDialog::cb_about),
-    null
+    _METHOD_CALLBACK (this, &MyDialog::cb_about)
   );
 
   key_F2->addCallback
   (
     "activate",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&MyDialog::cb_view),
-    null
+    _METHOD_CALLBACK (this, &MyDialog::cb_view)
   );
 
   key_F3->addCallback
   (
     "activate",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&MyDialog::cb_exitApp),
+    _METHOD_CALLBACK (this, &MyDialog::cb_exitApp),
     key_F3
   );
 }
 
 //----------------------------------------------------------------------
 MyDialog::~MyDialog()
-{
-}
+{ }
 
 //----------------------------------------------------------------------
-void MyDialog::onClose (FCloseEvent* event)
+void MyDialog::onClose (FCloseEvent* ev)
 {
-  int ret = FMessageBox::info ( this, "Quit",
-                                "Do you really want\n"
-                                "to quit the program ?",
-                                FMessageBox::Yes,
-                                FMessageBox::No );
+  int ret = FMessageBox::info ( this, "Quit"
+                              , "Do you really want\n"
+                                "to quit the program ?"
+                              , FMessageBox::Yes
+                              , FMessageBox::No );
   if ( ret == FMessageBox::Yes )
-    event->accept();
+    ev->accept();
   else
-    event->ignore();
+    ev->ignore();
 }
 
 //----------------------------------------------------------------------
@@ -444,13 +449,15 @@ void MyDialog::cb_noFunctionMsg (FWidget* widget, void*)
 //----------------------------------------------------------------------
 void MyDialog::cb_about (FWidget* widget, void*)
 {
+  const char ver[] = F_VERSION;
   FStatusKey* skey = static_cast<FStatusKey*>(widget);
   FString line(2, wchar_t(fc::BoxDrawingsHorizontal));
 
-  FMessageBox info ( "About", line + L" The Final Cut " + line + "\n\n"
-                     L"Version 0.1.1\n\n"
-                     L"(c) 2015 by Markus Gans",
-                     FMessageBox::Ok, 0, 0, this );
+  FMessageBox info ( "About"
+                   , line + L" The Final Cut " + line + "\n\n"
+                     L"Version " + ver + "\n\n"
+                     L"(c) 2015 by Markus Gans"
+                   , FMessageBox::Ok, 0, 0, this );
   info.setCenterText();
   info.show();
   skey->unsetActive();
@@ -460,21 +467,21 @@ void MyDialog::cb_about (FWidget* widget, void*)
 void MyDialog::cb_info (FWidget*, void*)
 {
   {
-    FMessageBox info1 ( "Environment",
-                        "  Type: " + FString(getTermType()) + "\n"
+    FMessageBox info1 ( "Environment"
+                      , "  Type: " + FString(getTermType()) + "\n"
                         "  Name: " + FString(getTermName()) + "\n"
-                        "  Mode: " + FString(getEncoding()),
-                        FMessageBox::Ok, 0, 0, this );
+                        "  Mode: " + FString(getEncoding())
+                      , FMessageBox::Ok, 0, 0, this );
     info1.setHeadline("Terminal:");
     info1.exec();
   } // end of scope => delete info1
 
   FString line(15, wchar_t(fc::BoxDrawingsHorizontal));
-  FMessageBox info2 ( "Drive symbols",
-                      "Generic:       \n\n"
+  FMessageBox info2 ( "Drive symbols"
+                    , "Generic:       \n\n"
                       "Network:       \n\n"
-                      "     CD:",
-                      FMessageBox::Ok, 0, 0, this );
+                      "     CD:"
+                    , FMessageBox::Ok, 0, 0, this );
   if ( isNewFont() )
   {
     FLabel drive (NF_Drive, &info2);
@@ -526,8 +533,8 @@ void MyDialog::cb_setTitlebar (FWidget* widget, void*)
 {
   FLineEdit* lineedit = static_cast<FLineEdit*>(widget);
   lineedit->setXTermTitle(lineedit->getText());
-  this->setText(lineedit->getText());
-  this->redraw();
+  setText(lineedit->getText());
+  redraw();
 }
 
 //----------------------------------------------------------------------
@@ -629,13 +636,13 @@ void MyDialog::cb_exitApp (FWidget*, void* data_ptr)
 //----------------------------------------------------------------------
 void MyDialog::adjustSize()
 {
-  int h = parentWidget()->getHeight() - 3;
+  int h = parentWidget()->getHeight() - 4;
   setHeight (h, false);
   int X = int((parentWidget()->getWidth() - getWidth()) / 2);
   if ( X < 1 )
     X = 1;
   setX (X, false);
-  myList->setHeight (getHeight() - 3, false);
+  myList->setHeight (getHeight() - 4, false);
   FDialog::adjustSize();
 }
 
@@ -664,7 +671,7 @@ int main (int argc, char* argv[])
 
   MyDialog d(&app);
   d.setText ("The FINAL CUT 0.1.1 (C) 2015 by Markus Gans");
-  d.setGeometry (int((app.getWidth()-56)/2), 2, 56, app.getHeight()-3);
+  d.setGeometry (int((app.getWidth()-56)/2), 2, 56, app.getHeight()-4);
   d.setShadow();
 
   app.setMainWidget(&d);
diff --git a/test/watch.cpp b/test/watch.cpp
index 5bf124a6..0d1e0022 100644
--- a/test/watch.cpp
+++ b/test/watch.cpp
@@ -83,27 +83,21 @@ watch::watch (FWidget* parent)
   clock_sw->addCallback
   (
     "toggled",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&watch::cb_clock),
-    null
+    _METHOD_CALLBACK (this, &watch::cb_clock)
   );
 
   // Connect switch signal "toggled" with a callback member function
   seconds_sw->addCallback
   (
     "toggled",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&watch::cb_seconds),
-    null
+    _METHOD_CALLBACK (this, &watch::cb_seconds)
   );
 
   // Connect button signal "clicked" with a callback member function
   quit_btn->addCallback
   (
     "clicked",
-    this,
-    reinterpret_cast<FWidget::FMemberCallback>(&watch::cb_exitApp),
-    null
+    _METHOD_CALLBACK (this, &watch::cb_exitApp)
   );
 }