Hello Sathish,
The names of the brushes you need to change are as follows:
- for the normal state: Background "ExpanderButtonNormal_Background", Border "ExpanderButtonNormal_Border"
- for the mouseover state: Background "ExpanderButtonOver_Background", Border "ExpandButtonOver_OuterBorder"
Let me know if you have further questions.
Kind regards,
Dimitrina
the Telerik team
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