SOLVED! tabBkg.cells('pax').attachGrid() not a function

I have the following code snippets:

tabBooking = new dhtmlXTabBar('dvtabBooking');
tabBooking.setImagePath('/javascripts/dhtmlx/dhtmlxTabbar/codebase/imgs');
tabBooking.addTab('pax','Passengers','100px');
tabBooking.addTab('rmks','Remarks','100px');
tabBooking.addTab('conds','Conditions','100px');

grdPax = tabBooking.cells('pax').attachGrid();

However Firbug is complaining that 'tabBooking.cells(‘pax’).attachGrid() is not a function.

I have the following javascript files included:

dhtmlxcommon.js
dhtmlxtabbar.js
dhtmlxgrid.js
dhtmlxgridcell.js

The tabBooking is being properly created.

Please can you tell me what I’m doing wrong.

Thanks
Purvez

I just compared something else that was working and found that I needed dhtmlxcontainer.js as well.

Thanks