[Gnumed-devel] IsVisible() solution

[Horst Herb]

Regarding the lazy refreshing of Widgets, I was surprised that Karsten was 
right, and IsShown() always returned tru.

The fix is:
self._panel.GetUpdateRegion().IsEmpty()

This returns true if the Window is not visible, and false if it is visible

To ensure that Windows are notified even if they are visible at the time when 
the OnPatientChanged message is dispatched (=no PAint event generated for 
them), the OnPatientChanged callback must include:
Refresh()
as a method of the panel in question.

This seems to work.

Horst