columnspan

Best Way To Span Multiple Columns in WPF Grid/List?

I have a custom user control I wrote in WPF to display some data. I want to show this usercontrol in a list, but I also want to provide multiple column headers (matching some properties on the user cotrol) so users can sort on properties contained in the usercontrol. I am not sure the best way to go about this. I currently have a Lis...