Hello,
This is a RadToggleButton which is present in the EditableTemplate of RadComboBox.
To apply any changes, you need the Expression dark theme resources for RadComboBox. You can obtain these from your RadControls installation folder, Themes folder.
The Style you need to edit is the
EditableComboToggleButtonStyle.
I hope this helps.
Regards,
Dani
the Telerik team
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