private void btnCurriculum_Click(object sender, EventArgs e) { if (CurriculumDockWindow == null) { CurriculumDockWindow = new DocumentWindow(); CurriculumDockWindow.CloseAction = DockWindowCloseAction.Close; fmManageCurriculum = new frmManageCurriculum(); fmManageCurriculum.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None; fmManageCurriculum.TopLevel = false; fmManageCurriculum.Dock = DockStyle.Fill; CurriculumDockWindow.Text = fmManageCurriculum.Text; CurriculumDockWindow.Controls.Add(fmManageCurriculum); this.radDock1.AddDocument(CurriculumDockWindow); fmManageCurriculum.Show(); } else { CurriculumDockWindow.Show(); } this.radDock1.ActiveWindow = CurriculumDockWindow; }