ExtJs 4 : Tree grid panel filter - extjs4

Question

I am using ExtJs 4 with a Tree panel on west region and TreeGrid panel on center region. Is there any way to filter the TreeGrid panel(center region) on selection of the treepanel(west) ??
I tried the following but no luck :
Ext.define('MyApp.view.MyViewport', {
extend: 'MyApp.view.ui.MyViewport',
initComponent: function() {
var me = this;
me.callParent(arguments);
me.down('#westTreePanel').getSelectionModel().on('selectionchange',me.CenterTreeFilter,me);
}, //end of initComponent
CenterTreeFilter: function(){
var selection = this.down('#westTreePanel').getView().getSelectionModel().getSelection()[0];
var centerTreeGrid = this.down('#centerTreeGrid');
console.log(selection.data.text);
centerTreeGrid.store.filterBy(function(rec, id){
console.log(rec);
return (rec.store("text") == selection.data.text);
});
console.log("sub store : " + this.down('#centerTreeGrid').getStore().storeId);
}
});

Answer 1

After days of fighting with this issue, I was finally able to get the functionality, albeit in a not so satisfying way. Also, only leaf nodes are currently hidden.
filtering all nodes that don't mention "text":
t.getRootNode().cascadeBy(function(n){
if (!n.hasChildNodes() &&
n.raw && n.raw.text.toLowerCase().indexOf(text.toLowerCase()) < 0) {
toRemove.push({ node: n, parent: n.parentNode });
}
});
To restore later, run:
function restoreTrees() {
for (var n in toRemove) {
toRemove[n].parent.appendChild(toRemove[n].node);
}
toRemove = [];
}
There are many flaws with this solution. Including that the restored tree will probably have a different ordering for their nodes. But hey, at least this is some progress.
Would love to see a better one! (Had it working beautifully in Ext JS 3, but now these darn nodes don't have a .ui.hide() function any more).

Answer 2

i've checked their example http://dev.sencha.com/deploy/ext-4.0.2a/examples/tree/treegrid.html, in fact the issue here is that the store for the treeGrid is a tree store which doesn;t have the method filterBy , the method filterBy is defined in ext.data.store and treeStore extends ext.data.abstractStore.. as i see it you have to apply your filters diferently, using the the filters config for the treeStore. You can define your filter and set the filterOnLoad on true and instead of calling the filterBy method do centerTreeGrid.store.fireEvent('load',selection). I hope this helps you
Edit
I haven't used filters for tree stores but i think you can do something like this
var treeFilter = new Ext.util.Filter({
filterFn: function(rec) {
console.log(rec);
return (rec.store("text") == selection.data.text);
});
And assign the filter to the treeStore in the initComponent
centerGrid.store.filters.add(treeFilter);
centerGrid.store.filterOnLoad = true;
And in the CenterTreeFilter function
centerGrid.store.fireEvent('load',selection);
P.s the code is untested and probably it will need some modifications, but i think this is the way to do it.