[news.eclipse.platform.swt] Making controls appear/disappear in a compos

[Fabio Mancinelli <fabio.mancinelli@xxxxxxxxx>]

Dear all.

I have a composite with two children:

+---------------+
|               |
|Editing area   |
|               |
+---------------+
|Toolbar area   |
+---------------+

Now I would like to show only the editing area and,
when some conditions are true I would like to show (maybe with an 
animation) the toolbar area.
The toolbar area should then disappear (maybe with an animation) when 
the previous conditions become false.

Using setVisible is not good for me because the area allocated to the 
Toolbar stays visible producing a gap between the bottom of the editing 
area and the composite bottom border.

Any hints on how to do this?

Thanks.

Cheers,
Fabio