private void ListenerControl_Paint(object sender, PaintEventArgs e)
{
e.Graphics.DrawRectangle(new Pen(SystemColors.ActiveBorder, 1),
cboReceiverInspector.Location.X - 1,
cboReceiverInspector.Location.Y - 1,
cboReceiverInspector.Size.Width + 1,
cboReceiverInspector.Size.Height + 1);
}