var contextMenu:ContextMenu = new ContextMenu();

        contextMenu.hideBuiltInItems();

        var contactList : ContextMenuItem = new ContextMenuItem("Add to Existing List");
        contactList.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT, doStaticListCommand);

        var newContactList : ContextMenuItem = new ContextMenuItem("Add a New List");
        newContactList.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT, doNewStaticListCommand); 

        var removeContactList : ContextMenuItem = new ContextMenuItem("Remove contact from List");
        removeContactList.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT, doRemoveListCommand);

        var deletecontact:ContextMenuItem = new ContextMenuItem("Delete contact");
        deletecontact.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT, dodeleteconactCommand);

        var TimeList : ContextMenuItem = new ContextMenuItem("Add Time Spent");
        TimeList.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT, doTimeListCommand);

        contextMenu.customItems.push(contactList);      

        contextMenu.customItems.push(newContactList);           

        contextMenu.customItems.push(deletecontact);

         contextMenu.customItems.push(removeContactList);

In flex i done contex menu , if i rigt click then show context menu item but i want to hidden particular context menu item in list , is it possiable hidden and show particular items in context menu ? please refer me