private void MenuItemAddZSumbol_Click(object sender, RoutedEventArgs e)
        {
            var wnd = new ZSumbolPropertiesWindow();

            if (wnd.ShowDialog() == true)
            {
                AddZSumbolElement(wnd.Vector2DPosition.ValueInPixel, 250, 140, wnd.StrokeThickness);
            }
        }
        private void MenuItemAddZSumbol_Click(object sender, RoutedEventArgs e)
        {
            var wnd = new ZSumbolPropertiesWindow();

            if (wnd.ShowDialog() == true)
            {
                AddZSumbolElement(wnd.Vector2DPosition.ValueInPixel, 250, 140, wnd.StrokeThickness, new Point());

                PushCommandToHistory(new AddCommand(this, m_LoadedCanvasItems.Last()));
            }
        }