ComboBox class which doesn't catch mouse wheel event rather it passes to other controls

UnscrollableComboBox.cs

//Combobox will handle mouse wheel event, but if you want to combobox which won't handle mouse wheel
//event, rather pass to the parent, use this class
public class UnscrollableComboBox : ComboBox
{
    protected override void WndProc(ref Message m)
    {
        if (m.Msg == 0x20a && this.Parent != null)
        {
            PostMessage(this.Parent.Handle, m.Msg, m.WParam, m.LParam);
        }
        else
        {
            base.WndProc(ref m);
        }
    }


    [DllImport("user32.dll")]
    private static extern IntPtr PostMessage(IntPtr hWnd, int msg, IntPtr wp, IntPtr lp);
}