Unfortunately, the manual setting of ZIndex
is a problem introduced by the latest plug-in version of Silverlight. We have reported this issue to Microsoft and we hope that they will consider changing this behavior, because it's quite inconvinient not to use this property. That is why, RadWindow currently doesn't support the TopMost functionality. Moreover, the ZIndex is controlled by the framework, and the only way to have a menu over our RadWindow control is to open the menu after you have opened the RadWindow control. In this way the ZIndex of the most recent control will have the highest ZIndex order.
the Telerik team
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