Default styles as well as the control templates for native MS ComboBox and Telerik RadComboBox are different. Therefore when trying to make one of them have the same look and feel as the other one, you will have to manually modify the style for the control.
When trying to customize RadComboBox to look as your customized ComboBox control, please take into consideration the fact that RadComboBox has a default Office Black theme, which is reflected by a ButtonChrome
control inside the template of RadComboBox. You may need to generate and customize the button chrome as well. Also, remember to make your modifications both on the Editable
ControlTemplates of RadComboBox.
I hope this helps.
the Telerik team
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