Hi, I tried to add a new component in this file.
I tried but it didn't work :
I finaly found the reason : this file can be found in the uiDesigner.jar
in the plugin directory, but in the build 833 it's still in idea.jar and
only the file in idea.jar is read by Idea.
When I added my component (a JDesktopPane) in the idea.jar's
uiDesigner.Palette.xml it worked fine (after restarting Idea of course).
So do not make the same mistake as I did (: