SplitContainer works beautifully however as it is now mature and stable I though we could had a great functionality needed by many.
The Idea you would be to have two attribute:

• The first one would define if the SplitContainer will use this functionality isCollapsable. By default setting will set to isCollapsable=false.
• The second will inform the script on the direction in which the SplitContainer should collapse:
  • "top,bottom" for horizontal SplitContainer, set by default to "bottom"
  • "left,right" for the vertical SplitContainer, set by default to "left"

  Seb

I agree this is a good feature, but it's something I'd like to add to a new BorderLayout widget, to work similarly to how EXT does.