delegate void SetFormParent(Form f,Form f1);
        private void SetForm(Form fparent,Form fchild)
        {
            if (fchild.InvokeRequired)
            {
                SetFormParent d = new SetFormParent(SetForm);
                this.Invoke(d, new object[] { fparent,fchild });
            }
            else
            {
                fchild.MdiParent = fparent;

            }
        }