Dashcode - Widget "Check for Update" button.

Hey there,

Recently just decided to have a quick blast at making something easy in the Developer Tools, and decided on a little Dashboard Widget. I was wondering if there's anyway to add a "Check for Update" button onto the info pane of the widget, then return a message like "No update available" or "Update available, download at http://.......". Just wondering how I would go about doing this...