public ToolStripDropDown () : base ()
{
SetStyle (ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
SetStyle (ControlStyles.ResizeRedraw, true);
this.auto_close = true;
is_visible = false;
this.DefaultDropDownDirection = ToolStripDropDownDirection.Right;
this.GripStyle = ToolStripGripStyle.Hidden;
this.is_toplevel = true;
}
#endregion