NetBeans-JavaFX-Soma: #195

The palette contains both categories:
- Swing Components 
- Controls

The Swing Components category contains the same items 
(except Combo Box, but it can be added as ChoiceBox to Controls,
see issue 182577) as the Controls category.

Using the  Swing Components causes the warning 
"warning: [warnonuse] Package javafx.ext has been used."
and can lead to the performance issue on Prism stack.

So it is better to remove the Swing Components category from the Palette.

However users can use the Swing Component using the Fix Imports and Code Completion features on their own risk.