endmodal function not closing secondary page. The secondary page control is on the main page.

I have created a popup-menu that executes a secondary page.    The page is used to lookup an email address in contacts where an invoice for that customer exists in the invoice extract tables.  The secondary page does come up and the search button works.     When email address is selected from a grid (list), the secondary page is supposed to close.   I have an endmodal(1) on the select field.  

The main page has the secondary page control object in the level 1 of the page.  What would cause the endmodal to not close the page?   What do I need to check?