RadControls ship with nine ready-to-use themes. You can use them to customize the appearance of the RadWindow control. The one you are referring to and the one that is used thoughout our online demos is the Metro theme. Other themes include: Office Black, Office Blue, Office SIlver, Vista, Summer, Windows7, Transparent, Expression Dark. You can check all of them in the theming example
So to force your instance of RadWindow to have the look and feel of any of the themes, you should apply a theme to it. In XAML:
Or set an application theme:
If you choose to have one of the themes , but wish to apply additional changes to the look & feel, you should make customizations upon the XAML for that particular theme.
I hope this helps.
the Telerik team
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