private void barButtonItemTest_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e) { try { FormGenConfigClass frm = new FormGenConfigClass(); frm.MdiParent = this; frm.Show(); Form1 frm2 = new Form1(); frm2.MdiParent = this; frm2.Show(); Form2 frm22 = new Form2(); if (frm22.IsMdiContainer) { frm22.IsMdiContainer = false; frm22.MdiParent = this; } else { frm22.MdiParent = this; } frm22.StartPosition = FormStartPosition.CenterScreen; frm22.Show(); frm22.Activate(); UserControl1 cl = new UserControl1(); Form1 frm211 = new Form1(); frm211.Controls.Add(cl); frm211.IsMdiContainer = false; frm211.MdiParent = this; frm211.Show(); } catch (Exception ex) { MessageBox.Show(ex.Message); } }