Failed to recognize the new childcount

I tried to retrieve an element's ChildCount, it originally is 9. Then I called Touch(), it will expands and show up a sub menu. By using ObjectSpy, its ChildCount becomes 17. However I can't get the number 17 using neither script nor keyword test. Is there a way to force TC to read the new object?

Original:

a

b

c

After touch:

a

b

>b1

>b2

>b3

c

Script:

var x = new definitions.Category_List_Page();
Log.Message(x.numOfCategories);
var cat = definitions.get_CLP_subCatItem(2);
cat.Touch();
Delay(6000);
var y = new definitions.Category_List_Page();
Log.Message(y.numOfCategories);

The only workaround I can use, is probably recognize each status of the list (by expanding each sub item) to be different objects:

1) default page with no sub items expanded/touched

2) page1 with item 1 touched

3) page2 with item 2 touched

......

But this sounds silly.