Version: ExtJs 4.1

To change the child items I use this function:

TreeStore (Ext.data.TreeStore)

storeId  : 'treeStore',
...
constructor: function( oConfig ) {
...
this.on( 'expand', function( oObj ) {           
        oObj.eachChild(function(oNode) {
           switch(oNode.data.type) {
              case "report":
                 oNode.set('icon', strIconReport);
              break;
              case "view":
                 oNode.set('icon', strIconView);
              break;
           }
        });
     });

Reload

After removing or adding items in the tree, I reload the tree somewhere else with:

var oStore = Ext.getStore('treeStore');
oStore.load({
        node     : oNode,
        params   : { 
           newpath     : oNode.data.path, 
           overwrite   : true
        }
     }); 

Although it is the same store treeStore, after loading and expanding to the correct path, the icons are not changed since the .on( 'expand') function is not called. Why?

Question

How can I change the icons of this newly loaded store before it expands to the node path?

What I tried

Before calling .load() I tried to edit the children with oNode.eachChild(function(oChild) {} but no success.