iView development - compatibility with Blackberry?

We have a request to make some existing portal ivews (Java/JSP/HTMLB) available for Blackberry. Accessing iViews that were developed for the portal (as-is) from Blackberry yeilds various results. Of the iviews that do render on the blackberry, it seems that the htmlb buttons/drop-down lists/etc do not function properly...

Is htmlb compatible with blackberry?

Can iviews created specifically for protal (in java/jsp) be modified to function on blackberry?

Is WebDynpro a recommended or better approach for making iviews accessible to both portal and blackberry?

Any input/feedback would be greatly appreciated...

Thanks,

Scott