You see above in my dropdownboxs I don't have .bindItems to bind the itemlist and filter to it:
When oDropdownBox change event is triggered then:
oDropdownBox2.bindItems("/data", oItemTemplate2, null, filters:[oFilter]);
So what I'm trying to ask is there to possibly filter the second dropdownbox list using my current code for dropdownboxs.
I wrote a small test script just with a simple dropdownbox and itemtemplate that worked but I have no idea how to apply the same theory to the way I have it done above in my original comment.