Hello Hendrik,
Thank you for contacting us.
In order to change the background of the Selected Side you can evaluate the
RadCube.SelectedIndex and then to select the related
RadCube.SideXBackground (where the
X is from 1 to 6).
But if you want to set the border's brush and thickness then you should instantiate a Border element inside each of your cube's sides. Again you should evaluate the SelectedIndex to get the right border.
Please try the suggested approach and let us know if have other questions.
Greetings,
Ivan
the Telerik team
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