protected virtual void OnParentChanged (ToolStrip oldParent, ToolStrip newParent)
{
//this.text_size = TextRenderer.MeasureText (this.Text == null ? string.Empty : this.text, this.Font, Size.Empty, TextFormatFlags.HidePrefix);
if (oldParent != null)
oldParent.PerformLayout ();
if (newParent != null)
newParent.PerformLayout ();
}