如何在代码/ xaml中为WPF显示UniformGrid中的网格线？

I would like to know how to show grid line in UniformGrid for WPF. I know that it is easy to set Grid line in normal Grid, but I find that UniformGrid cannot set Grid line like that of normal Grid. It is good to give simple example for both of code and xaml because I want to be more flexible in programming. Thanks!I would like to know how to show grid line in U