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Problem changing/upgrading properties on WebParts that have already been deployed and added to Share

Posted By:      Posted Date: August 30, 2010    Points: 0   Category :SharePoint
I have created two custom webparts which I deploy as a Feature within a Solution.  These webparts have been added to various pages on my site.  Due to design changes, I upgraded the webparts with some new functionality and some other changes to the webpart properties, such as the WebPart title, title icon and catalog icon.  After I have retracted/deleted the old solution and re-deployed the new solution (and activated the feature) the webparts have been upgraded fine, however, the webpart properties were not changed for any webparts that were already added to pages.  I can add new instances of the webparts and they have the updated properties (and also show correctly in the wp gallery and catalog). Is there a step I am missing in order to upgrade any webparts (namely the properties) that have already been added to pages?  Or is this something I have to take care of programmatically somehow to workaround the upgrade problem?

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