如何从页面上的控件访问页面上的GridView？

I have an aspx page which has a GridView and a Panel with Summary Data. The Summary Data is in a control and the GridView is on the aspx page. When someone clicks an item in the Summary Data, I want to rebind the GridView, but I can't figure out how to do it from the control.I have an aspx page which has a GridView and a