//
        public TabPage Add(Form form, string str_frm_name)
        {
            form.Visible = true;
            form.TopLevel = false;
            form.Dock = DockStyle.Fill;
            form.FormBorderStyle = FormBorderStyle.None;
            TabPage page = new TabPage();
            page.Controls.Add(form);
            form.Show();
            //this.Controls.Add(page);
            this.tabControl1.Controls.Add(page);
            page.Text = str_frm_name + " ";
            return page;
        }