Bug 21583 Generate Javadoc won't link prereqed projects
In the export wizard for generating javadoc, there is no easy way to link the javadoc from a prereqed project. The wizard has a screen for linking in javadoc from libraries included in the classpath, but projects in the classpath do not show up. I got a temporary workaround from the news group. Just add a "-link URL_TO_OTHER_PROJECT_JAVADOC" in the javadoc options page, but there should be an easier way to do this.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javadocexport/JavadocStandardWizardPage.java
UpdateCheckedListGroup();
		} else {
			String hrefs= makeHrefString();
			fTempLinks.put(fWizard.getProject(), hrefs);	
		}
	}
	public void UpdateCheckedListGroup() {
	
		List referencedClasses = new ArrayList();
		List visited = new ArrayList();
		try {
			IJavaProject currProject = fWizard.getProject();
			if (lastProject != currProject) {
				lastProject= currProject;
				getElements(referencedClasses, currProject, visited);
				fListDialogField.removeAllElements();
				fListDialogField.addElements(referencedClasses);
				
				checkListDialogFieldElements(referencedClasses);
			}
		} catch (JavaModelException e) {
			JavaPlugin.log(e);
		}
	}
	
	public void init() {
		updateStatus(new StatusInfo());
	}
	
	protected class FlaggedButton {