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Two VF pages in a dashboard


I have created a dashboard with two columns and have two VF pages in them. Both these pages share a same controller. I have a button in the first VF page and when it is clicked, i want to rerender a section in the second VF page to display the modified data in the controller.

Could someone please help me in triggering the rerender event in seconf vf page from first one.

I don't think you'll be able to do this as the iframes can't find each other via the parent DOM as they come from a different server to the dashboard itself (the browser blocks this as a cross site scripting attack).