Hello, Victor,
In order to obtain disabled style for the arrow button, it is necessary to set the RootElement.UseDefaultDisabledPaint property to true:
this.radDropDownList1.Enabled = false;
this.radDropDownList1.RootElement.UseDefaultDisabledPaint = true;
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik
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