internal ContextMenuStrip GetContextMenu(TreeListNode senderNode)
 {
     _mniAddFunction = _mainForm.GetFunctionContextMenu().BuildAddFunctionMenu(_mainForm.GetPolicyContextMenu().mnuPolicy, _menuItemCaption_AddFunc,
                                                                               false, senderNode);
     GreyState(senderNode);
     return(mnuPolicy);
 }