Tabbed Pages in Access - How to refer to controls on tabbed pages or refresh a tabbed page Access 2010 VBA

Using Access 2010 ,I had 3 separate forms in a database. All was working fine.

Then it was suggested to me that I should use Tabbed Pages for better navigation.

However in so doing this, some of my functionality has gone off the rails.

I created a New form called frm_main. Then on that form I added a Tab Control called TabCtl0.

On that TabCtl0, I have 3 pages. So I basically dragged and dropped the 3 forms on it's own pages.

So far so good, until I started testing some things.

For instance, on Accounts form I had a lookup combobox  that you enter a value and the record is returned on the screen..

The code I had was on the afterUpdate event was

    Dim lnSearchID As Long
    lnSearchID = cmbo_Search.Column(0)
    DoCmd.OpenForm "frm_Master", acNormal, , "l_ID = " & lnSearchID

But now that form "Frm_Master" is sitting on a page on a tabbed control.

How would I get the form to reload and return the correct record? In other words if that form is now on a another form sitting in a tabbed control, on a page??

Another example is on the form load of another form..I have a subform where a field refers to a date selected on the main form

Batch = Forms!frm_invoiceBatch!txt_ID.Value

The error is can't find referenced form "frm_InvoiceBatch", which tells me I need to refer the tab control, then page , then form..just not sure what the syntax would be.

All this worked till I moved the form to the tabbed pages

Any insight or direction would be much appreciated.