I have an ItemRenderer that is shared by several applications (inside a DataGrid), and I would like to add a context menu to it (rather than in each application). The renderer is derived from the Canvas class, and the code to create the context menu looks something like:

            var menuItem:ContextMenuItem = new ContextMenuItem("Test");
            menuItem.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT, contextCallback);

            var customContextMenu:ContextMenu = new ContextMenu();              
            customContextMenu.hideBuiltInItems(); //hide flash menu
            customContextMenu.customItems.push(menuItem);               
            this.contextMenu = customContextMenu;

However, when I right click on the cell in the datagrid, I get the default Flash Context Menu. Is this not possible?