[incubator] Adding GlassPanel to arbitary Widgets

I need to show a faded background over my widget[a DisclosurePanel]
when an error message pops up.

The GlassPanel from the Incubator can only be added to AbsolutePanels.

Anyway to add GlassPanel over arbitary Widgets (specifically
DisclosurePanel)??

Regards,
Nirmal

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