If ChooseBean doesn't show your org.test.mypalette.MyPanel
class then is it definitely
in the build path of the project ?
If you just go to the source code and
add it by hand does it compile OK ?
From reading your note my first guess
would be that you don't have MyPanel available to the project.
However you must have something in the
build path to trigger your palette.xmi file to be included - I presume
that is some container of some sort ?
In the Packages viewer can you select
your project and expand the container and make sure that MyPanel is actually
there ? You might have to change some of the
package explorer filter options to let
it show you the dependent jar entries - these options are available on
the Filter dialog that you open from the little down arrow on the
top right corner of the Packages viewer.