Default Opening App Folders

hey all i need a bit of help and i hope i can explain this properly, here goes:

i am working on a homescreen and i have a popup widget appearing when i press an icon, it slides on the screen and shows 4 icons which will be apps, this is working ok but i want on of the 4 icons to open an app folder but cant work out what Module Ontap to use

hopefully someone can help, thank you!