[news.eclipse.newcomer] How to get a pop up doalogue to interact with se

[capitonis@xxxxxxxxxxx (Martin)]

I'm trying to create a plugin that integrates into the menu you get when 
you right click a project in the Resource Navigator. The plug in is 
intended to open the .cdt project file of the project and modify it. 
Therefore I need to be able to read the project properties, but I can't 
seem to get it to work. From what I've gathered I need to access the 
IWorkspaceRoot, from which these properties should be readable. From one 
article here I got the suggestion to use

IWorkspaceRoot myWorkspaceRoot = ResourcesPlugin.getWorkspace().getRoot();
IProject myWebProject = myWorkspaceRoot.getProject("ttt");

"ttt" is the name of the project which has been gotten from the name of 
the selection.
However, this generates this error when running it 
"Could not create action delegate for id: ProjectPathExpander.addMultiple
Reason:
Internal plug-in action delegate error on creation."

So, two questions:
-Where in my plugin should this go to actually work? I've tried it in the 
run() method and in the setActivePart() methods with the same results.
-If this doesn't work, what other methods are there to accessing this data?

I'm running Eclipse 3.0.2 on Solaris.