-// _modelManager = NULL;
- _instantPanel = NULL;
-// _buttonsBar = NULL;
-// _gridPanel = NULL;
-// _drawToolsPanel = NULL;
-// _operationsToolsPanel = NULL;
-// _autoFormsPanel = NULL;
-// _standardToolsPanel = NULL;
-// _editionToolsPanel = NULL;
-// _listViewPanel = NULL;
-// _sceneManager = NULL;
-// _actualInstant = NULL;