I'm in the middle of converting a Eclipse 2.x based 
application to Eclipse 3.1. We have a number 
of places where we are making dynamic contributions to menus programmatically 
instead of defining things in plugin.xml files.  I wasn't on the project 
when this was designed so don't ask me for the exact reasoning behind the 
code.  The best I've gotten when asked was that the functionality to 
determine contributions based on selected objects, etc was not enough in 
2.1.  Anyway...It seems that the isVisible() method of 
ActionContributionItem has changed to:
return super.isVisible() && 
isCommandActive();
Our code 
doesn't take into account defining a Command object for each action. This causes and error to be 
logged the first time isVisible() is called. What is the proper way to define 
command for dynamically created actions? 
It seems when I attempt to lookup a command a CommandWrapper object is returned 
which does not have public access. Therefore I can't get access to the 
underlying Command object to define it. All other places that have such access 
seem to be related to creating commands based off of plugin.xml which isn't what I 
want.
Finally if 
anyone could point out any examples in other parts of Eclipse (the 
jdt possibly?) where actions are 
being dynamically created it would be 
appreciated.  I'd like to rewrite the mess I've inherited in a more correct 
manner.
Scott