I have been trying to draw shapes on a SWT Composite and apparently
this is not possible. I can draw over a Shell or a SWT Canvas. But
drawing over a Composite does not work.

Canvas extends from Composite and looking at the source code I can se
it adds very little behaviour to composite.

All the documentation and articles I have been reading suggest that you
should draw on a Canvas, but it also says that any control that can
return a GC is available for drawing. A composite does return a GC ...

Therefore I'm wondering if my problem with the Composite is a bug of if
drawing on it is not allowed, and if a Canvas should be only used for
painting.

Thanks in advance for the help and tips you can provide me :)

Caro