private static void MyColsProperty_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DesignerCanvas designerCanvas = (DesignerCanvas)d;
int myCols = (int)e.NewValue;
if (myCols > 0 && designerCanvas.MyRows > 0 &&
designerCanvas.ActualHeight > 0 && designerCanvas.ActualWidth > 0)
{
designerCanvas.BrushGrid();
}
}
