protected override void OnShown(EventArgs e) { base.OnShown(e); var ChildForm = new ChildForm(); ChildForm.MdiParent = this; ChildForm.Show(); var ChildElementFormFixed = new ChildElementForm(true); ChildElementFormFixed.MdiParent = this; ChildElementFormFixed.Show(); var ChildElementForm = new ChildElementForm(false); ChildElementForm.MdiParent = this; ChildElementForm.Show(); }