Thanks. This is exactly what I'm looking for. Next, I would like to raise an event inside IF called ArrowClicked if the message is
WM_LBUTTONDOWN.

I'm not sure how to code.



>

>public class MyComboBox : ComboBox
>     protected override void WndProc(ref System.Windows.Forms.Message m)
>     {
>           if (m.Msg == 0x201 //WM_LBUTTONDOWN || m.Msg == 0x203)  //WM_LBUTTONDBLCLK
>           {
>                return;
>           }
>          base.WndProc(ref m);
>     }
>}
>
>or
>
>Public Class MyComboBox
>     Inherits ComboBox
>     Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
>          If m.Msg = &H201 OrElse m.Msg = &H203 Then 'WM_LBUTTONDOWN or WM_LBUTTONDBLCLK
>               Return
>          End If
>          MyBase.WndProc(m)
>
>     End Sub 'WndProc
>End Class 'MyComboBox
>
>
>