Generally, there are two ways to achieve your goal:
1. Prepare a separate CSS file for each RadControls skin that you are using and include some custom styles in each file. For example the DIV background will be blue when using the Vista skin and green when using the Hay skin, etc. Depending on the value of the RadSkinManager's Skin property, you will have to register one of these CSS files programmatically with a HtmlLink control.
$telerik.getCurrentStyle(element, styleAttribute, defaultValue
After reading the style property value, you can apply it to some other element on the page. However, this is somewhat cumbersome and resource-intensive operation and repeating it a large number of times will decrease the page client performance.
I suggest you to use option (1).
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