private void OnDockspaceDropDownClicked(object sender, CancelDropDownEventArgs e)
{
// Generate event so that the appropriate context menu options are preseted and actioned
KryptonDockingManager dockingManager = DockingManager;
if (dockingManager != null)
e.Cancel = !dockingManager.ShowPageContextMenuRequest(e.Page, e.KryptonContextMenu);
}