Problem with Setting Target (Frame)

Please help:
I have a problem with setting a target
(menuComponent.setTarget("<your_frame_target_name>").
I'm displaying the menu tree in the left frame, and when one of the
items is selected, the details of the item needs be displayed in the
right frame.
This works fine ONLY if the item selected is a leaf node, which means
the item does not have any sub menu.

Here is my code:
		HttpSession session = request.getSession();
		MenuRepository repository = new MenuRepository();
		MenuRepository defaultRepository =
(MenuRepository)session.getServletContext().getAttribute(MenuRepository.
MENU_REPOSITORY_KEY);
	
repository.setDisplayers(defaultRepository.getDisplayers());
		ArrayList wsList = workspaceList;  
		
		for (int i=0; i < wsList.size(); i++) {
			MenuComponent mc = new MenuComponent();
			WorkspaceTO to = (WorkspaceTO) wsList.get(i);
			String workspaceName = to.getName();
			
			mc.setName(workspaceName);
			String parentWorkspace =
to.getParentWorkspace();

			if (parentWorkspace!=null) { //All workspaces
have parent workspace in this case.
				MenuComponent parentMenu =
repository.getMenu(parentWorkspace);
				if (parentMenu == null) {
					parentMenu = new
MenuComponent();
	
parentMenu.setName(parentWorkspace);
	
//parentMenu.setTarget("frmBody");
					repository.addMenu(parentMenu);
				}
				mc.setParent(parentMenu);
			}

			if (workspaceName.equals("LIVE")) { 
				mc.setTitle("Workspace List:");
				mc.setAction(null);
			}else {
				mc.setTitle(workspaceName);
	
mc.setAction("/alternativeAnalysis/viewWorkspace.do?workspaceName="+work
spaceName);
			}
	
/***********************************************************************
***********/
			mc.setTarget("frmBody");  // this is a
right-hand side frame name.
	
/***********************************************************************
***********/
			repository.addMenu(mc);
		}	
mc.setTarget("frmBody") only works for the leaf  node (menu w/o sub men
in the tree menu structure).
When I looked at the source code
Have any idea??  Please help me with this problem.

Thank you.
Michelle