Fixed in SVN r49094. This bug couldn't be replicated if closing the window also quits the application (e.g. Zune Prefs), but could be seen in SimpleMail when closing the filters window.
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Do you have an example of a program that shows this bug?
not at hand but its easy to replicate..
create a simple gui with a pop button and object to display, press the button, close the window -> the child window is left orphaned on the display.
Fixed in SVN r49094. This bug couldn't be replicated if closing the window also quits the application (e.g. Zune Prefs), but could be seen in SimpleMail when closing the filters window.