Bug 4240 Can't edit class path entry (1GKEPIF)
There is no way to edit an existing entry for a library on the Java Build Path project properties page (other than editing the .classpath file directly). NOTES: EG (9/22/2001 11:42:11 AM) this is particularly annoying for variables. we should have an Edit button when a variable is selected.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/NewVariableEntryDialog.java
return EMPTY;
		}
	
		public Object getParent(Object element) {
			if (element instanceof File) {
				return ((File) element).getParentFile();
			}
			return null;
		}
	
		public boolean hasChildren(Object element) {
			return getChildren(element).length > 0;
		}
	
		public Object[] getElements(Object element) {
			return getChildren(element);
		}
	
		public void dispose() {
		}
	
		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
		}
	
	}	
	private VariableBlock fVariableBlock;
	private Button fExtensionButton;
	private Button fOkButton;
	
	private IPath[] fResultPaths;