Hello guys,
The problem here is that when when shown, RadWindow is in position where setting its height to 450px will make the window overlap the restriction zone's border (RadWindow is resized from top to bottom and from left to right).
To avoid that problem I would suggest to initially move the window to position 0,0. This way it will be properly resized and at the end of your code you center it, so it will be positioned correctly after that as well.
e.g.
Regards,
Georgi Tunev
the Telerik team
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