In order to change the BackColor of the ColumnChooser in RadGridView please refer to the following code snippet:
this.radGridView1.ColumnChooser.ColumnChooserControl.ColumnChooserElement.BackColor = Color.Green;
this.radGridView1.ColumnChooser.ColumnChooserControl.ColumnChooserElement.GradientStyle = GradientStyles.Solid;
I hope this helps. If you have other questions do not hesitate to contact me.
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