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Context on an empty tree/grid

I'm trying to get my context menu to work when the tree/grid is empty. I've tried to copy some of the responses to similar knowledgebase questions but have been unsuccessful. Hope you can point me in the right direction. Thanks.

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    context_menu = new dhtmlXMenuObject(null, "standard");
    context_menu.setImagePath("js/dhtmlxMenu/imgs/");
    context_menu.setIconsPath("js/dhtmlxMenu/imgs/");
    context_menu.renderAsContextMenu();
    context_menu.setOpenMode("web");
    context_menu.setWebModeTimeout(300);
    context_menu.loadXML("projects_context_menu.xml");
    
    ...
    
    project_grid = new dhtmlXGridObject('project_div');
    ...
    project_grid.enableContextMenu(context_menu);
    ...
    project_grid.init();
    project_grid.loadXML("load_projects.php");

    ...
    
    <div id="project_div" style="width:980px; height:260px;"></div>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The   next command
        project_grid.enableContextMenu(context_menu); 
enables context menu support for rows in grid. 
If you need to have it for empty space as well, you can add one more row
       context_menu.addContextZone('project_div');  //for dhtmlxmenu 2.x

I'm afraid I'm still unable to get it to work. 

I have both the following lines together in my code:
project_grid.enableContextMenu(context_menu);
context_menu.addContextZone('project_div'); 

They appear after the
context_menu.loadXML("projects_context_menu.xml");
but before the
project_grid.init(); and
project_grid.loadXML("load_projects.php");

I have dhtmlxmenu v.2.0 build 81009

Thanks. That worked, however, it appears that the addContextZone might be conflicting with (or preventing the triggering of) the 'onBeforeContextMenu' event:

 context_menu.attachEvent("onBeforeContextMenu", ...

Is there a workaround?  I'm using the 'onBeforeContextMenu' event to show/hide menu items, depending on the object the right-clicked is triggered from.

Thanks

onBeforeContextMenu generated only for cases when menu initialized by grid. In above case , the context menu use independent context call handler , so no event generated. 
You can try to use event of menu - "onContextMenu"

context_menu.attach_event("onContextMenu",function(id){
    //called nearly the same as onBeforeContextMenu event of grid, but will work for independent context zones as well
})