Refresh parent window from code behind

Prefix: http://stackoverflow.com/questions/10792408/open-popup-and-refresh-parent-page-on-close-popup

Can I get the opened (child) window to do a partial postback of the parent? I have a button on the parent which causes a partial postback when it's pressed, but not sure if you can invoke a button on the parent from a child, on close?

Thanks