protected void ClearCommandExecute()
{
CompleteTextEditing(true);
while (canvas.Children.Count > 2)
{
canvas.Children.RemoveAt(2);
}
URStack.Clear();
RaiseCommandsCanExecuteChanged();
SetCurrentValue(BackgroundImageSourceProperty, null);
}
protected void RedoCommandExecute()
{
canvas.Children.Add(URStack.Pop());
RaiseCommandsCanExecuteChanged();
}
protected void UndoCommandExecute()
{
URStack.Push(canvas.Children[canvas.Children.Count - 1] as UIElement);
canvas.Children.RemoveAt(canvas.Children.Count - 1);
RaiseCommandsCanExecuteChanged();
}
