//样式选择框
private void NodeStyleSelection_SelectionChanged(object sender, RoutedPropertyChangedEventArgs <object> e)
{
var newItem = (RibbonGalleryItem)e.NewValue;
ChangeStyle(newItem.ToolTipTitle);
if (NodeListBox.SelectedIndex == -1)
{
return;
}
myGraphRenderer.DrawGraph();
}
