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TreeGrid change image on open/close

Hello!

I need to change image on branch opens and close. Is there are some event like OnOpen and OnClose? It is strange but this code doesnt work well:

mygrid.attachEvent("onOpenStart",function(nodeId)
{
//this.setNodeIconOrWhatever(nodeId,"../controls/dhtmlxTreeGridPack/dhtmlxGrid/codebase/imgs/minus.gif");
mygrid.setItemImage(nodeId, "../images/tree/folderOpen.gif");
return true; // if function not return true, operation will be stoped
});
mygrid.attachEvent("onOpenEnd",function(nodeId)
{
mygrid.setItemImage(nodeId, "../images/tree/folder.gif");
//restore normal icon
//return true;
});

it is seems that onOpenStart rised once on first open and fall when branch finished opens and image became old. And when branch opens it is seems that onOpenEnd rised that is why image became old.

What is wrong with my code?

The order of event
    opening
       onOpenStart id,-1
       onOpenEnd id,1

    closing
       onOpenStart id,1
       onOpenEnd id,-1

the both event fired for both opening and closing , current state may be checked by second event parameter

mygrid.attachEvent("onOpenEnd",function(nodeId,mode)
{
if (mode==1)
    mygrid.setItemImage(nodeId, "../images/tree/folderOpen.gif");
else
    mygrid.setItemImage(nodeId, "../images/tree/folder.gif");
return true;
});

Ok.

Great Thanks!!!