http://forums.adobe.com/community/design_development/xmp_sdk?view=discussions might be the best place to post this question.
I'm not familiar with the XMP SDK, so this may not apply: Make sure your panel shows up. Delete the SWF that Flash Builder created, make sure your panel doesn't work. Now make a change in your code and check.
Also, you may want to check if Project -> Build Automatically is checked.
Hi. I'm trying to do the same thing (create custom xmp panels) and I'm having miserable luck following the XMP Fileinfo SDK.
I've installed Flash Builder 4. I've installed Apache Ant. Dumped the appropriate .jar file in the plugins section. Downloaded the AntView plugin and installed that and then created the MySample example.
It runs fine as a web application from FB and it appears to publish correctly (creating a .swf file in the target bin and writing it all out to the proper location in the Adobe xmp custom panels folder) but when I access the File Info screen in an Adobe product, I get a tab with MySample but the dc field doesn't show up.
I assumed it was a Flash trust file issue and created one, but it still doesn't work. I'm getting no errors and I've tried this a dozen times with the same results.
Was there some step that I missed that you see by any chance?