The RadMediaPlayer works fine in ChildWindow. You can examine this in the attached project. Please let us know if you need further assistance or more info on this.
All the best,
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items