private void documentcontainer1_DocumentTabOrderChanging(object sender, Syncfusion.Windows.Tools.Controls.DocumentTabOrderChangingEventArgs e)
 {
     // Restrict the TDI item re-ordering
     e.Cancel = true;
 }
 private void dockingmanager1_DocumentTabOrderChanging(object sender, Syncfusion.Windows.Tools.Controls.DocumentTabOrderChangingEventArgs e)
 {
     // Restrict the Tab item order changing
     e.Cancel = true;
 }