Bugs
~~~~
-

Improvements
~~~~~~~~~~~~
-

Missing Features
~~~~~~~~~~~~~~~~
- list/tree view with Columns
     - FListView()
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     /
     ├──► bin
     ├──▼ usr
     │  ├──► bin
     │  ├──► lib
     │  └──► local
     └──► tmp
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- Add a scrolling area with on-demand scroll bars for FButtonGroup
- Adding for flexible layouts a FGrid widget container that organizes 
  its child widgets in rows and columns