private void TextBlock_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
PropertyNodeItem current = (sender as TextBlock).DataContext as PropertyNodeItem;
current.SetIsSelectAll(!current.IsSelected.Value);
}
private void CheckBox_Click(object sender, RoutedEventArgs e)
{
PropertyNodeItem current = (sender as CheckBox).DataContext as PropertyNodeItem;
current.SetIsSelectAll(current.IsSelected.Value);
}