Bug 28510 java build path inconsistency [build path]
20021216 select rt.jar in the package explorer open properties it allows you to set the javadoc location but for source attachment you are sent somewhere else it's inconsistent - on the java build path they both look sort of the same (they sit under the same node in the tree)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/BuildPathsBlock.java
public void changeControlPressed(DialogField field) {
			buildPathChangeControlPressed(field);
		}
		
		
		public void dialogFieldChanged(DialogField field) {
			buildPathDialogFieldChanged(field);
		}
	}
	
	private void buildPathChangeControlPressed(DialogField field) {
		if (field == fBuildPathDialogField) {
			IContainer container= chooseContainer();
			if (container != null) {
				fBuildPathDialogField.setText(container.getFullPath().toString());
			}
		}
	}
	
	private void buildPathDialogFieldChanged(DialogField field) {
		if (field == fClassPathList) {
			updateClassPathStatus();
		} else if (field == fBuildPathDialogField) {
			updateOutputLocationStatus();
		}
		doStatusLineUpdate();