/// <summary>
/// RaiseCanExecuteChangedを呼び出すためのDeselectAllRectのラッパー
/// </summary>
private void DeselectAllRect()
{
appContext.UIData.DeselectAllRect();
RemoveRectCommand.RaiseCanExecuteChanged();
}
/// <summary>
/// RaiseCanExecuteChangedを呼び出すためのSelectRectのラッパー
/// </summary>
private void SelectRect(PlaceableElement rect)
{
appContext.UIData.SelectRect(rect);
RemoveRectCommand.RaiseCanExecuteChanged();
}