overlayed window like combo box

[sm_jamieson]

Is there any way in the SDK to produce a window that is on top of all other items and does not cause the
current containter to expand (i.e. like the combo box) ?
If I vary the size of an "on top" module, but it pushes the size of the patch window and moves things
around the screen.
I'd like to produce a cascading menu module which needs this capability.
Thanks,
Simon.