private void deleteToolStripMenuItem_Click(object sender, EventArgs e)
{
GlobalEvent.OnDocumentChangeBefore(Canvas.instance.GetCurrent(), "delete object");
var list = Canvas.instance.m_listObject;
var idx = list.IndexOf(this);
list.RemoveAt(idx);
Canvas.instance.Controls.Remove(this);
Dispose();
GlobalEvent.OnDocumentChangeAfter(Canvas.instance.GetCurrent(), "delete object");
}