radwindow moving causes parent page to go 'white'

[mabs]

I have a radwindow for a popup, if I move or resize the window, the parent page where the radwindowmanager is, goes white, i.e. all content is hidden untill the users stops moving the radwindow.  Any ideas what would cause this?

[mabs]

fixed, should have search a little better!

http://www.telerik.com/community/forums/aspnet-ajax/splitter/white-screen-when-moving-radwindow.aspx