public DiagramViewModel()
        {
            AddItemCommand = new SimpleCommand(ExecuteAddItemCommand);
            RemoveItemCommand = new SimpleCommand(ExecuteRemoveItemCommand);
            ClearSelectedItemsCommand = new SimpleCommand(ExecuteClearSelectedItemsCommand);
            CreateNewDiagramCommand = new SimpleCommand(ExecuteCreateNewDiagramCommand);

            Mediator.Instance.Register(this);
        }
 private void Init()
 {
     SelectItemCommand = new SimpleCommand(ExecuteSelectItemCommand);
 }
 private void Init()
 {
     SelectItemCommand = new SimpleCommand(ExecuteSelectItemCommand);
 }