This problem has stalled my work and I cannot figure it out.

I have a form and a subform.  The main form is divided into two pages in a 
tab control.  The subform is on the second page of the tab control.

If I go to the last record and click the Next button it continues to add 
blank records with only the Primary key in each record.  What usually 
happens is that once you reach the last record then next button on the 
Navigator group buttons is usually deselected.  This is not happening.

Could this be due to using a tab control ?

Thanks