In your case you have several options:
- You can use the RadSkinManager control in order to change the skins of all Telerik controls on the page. The control sets the default skin for all Telerik controls and this skin is applied if a control (RadEditor for example) does not have Skin property set explicitly.
- If you need to change the skin of a RadWindow (or any RadControl for ASP.NET AJAX), then you can set its Skin property to one of the embedded skins. They works out of the box and you just need to set the correct name to the control's Skin property.
- If the above solutions does not help and you need to build your custom skin and use it with RadWindow, then I recommend you to check these links:
I hope this helps.
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