private static void OnCellTemplateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
SudokuGrid grid = (SudokuGrid)d;
grid.ChangeCellTemplate();
}
private static void OnMiniCellStyleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
SudokuGrid grid = (SudokuGrid)d;
grid.ChangeMiniCellStyle();
}