MVC: comboBox/dropDownListBox in Page Fragment

Hi guys!

I've got the following setup:

Controller: MAIN (DO_INIT redefined to load the values for the user and a menu into a table)

Controller: PAGE (Superclass: MAIN)

View: Calls PAGE if I debug my values are there and in place and my user data is there.

Fragment: Header loaded with "inlcude" in PAGE without the comboBox or dropdownListBox it works and my user data is there, with it and my Application blows up with a short dump

The exception 'CX_BSP_ELEMENT_EXCEPTION' was raised but was not caught at any stage in the call hierarchy.

The reason for this exception is:

phtmlb:comboBox: Klasse CL_HTMLB_FORM wurde nicht gefunden als BSP-Parent-Element.

Anyone got an idea what I'm missing here?