Hello Paul,
The popup extender from the AjaxControlToolkit has a very, very high z-index by default (100001) and this is why it often hides other popups (like RadWindows or the RadDocks RadImageEditor uses). The way to avoid this is by overriding a CSS rule that will change the z-index values for one of the sets of controls, e.g.:
for the ACT modal popup OR
for RadDock.
The following article shows the default values for our controls and another way to change their z-indexes:
http://www.telerik.com/help/aspnet-ajax/controlling-absolute-positioning-with-zindex.html.
Regards,
Marin Bratanov
Telerik
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