Hi Kasthuri,
Please, find attached a sample of a customized ButtonChrome in RadComboBox template. The default NonEditable template has been modified. Whatever changes you make upon that template, please remember you might need to apply them to the Editable template, as well.
In the resources.png attached screenshot, you will see just where you can find all needed brushes of the generated ButtonChromeStyle. The customized_brushes.png shows a small illustrative change that was applied to that particular ButtonChromeStyle.
I hope this will be helpful.
Best wishes,
Dani
the Telerik team
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