Select field upon table/subtable opening

Hi there. 

I have a masterTable called ManagerLog, a subTable called MoneyCounter and a button in the master table called 'Click to Double Count Safe'. Here is the code for for the button (that works fine):

let myID := this;
let newRec := (create MoneyCounter);
newRec.(ManagerLog := myID);
newRec.('What Are You Counting' := 1);
let myRN := number(newRec.Id);
popupRecord(record(MoneyCounter,myRN))

The first field in the subtable MoneyCounter is '1’s - # Bundles (#25)'. 

Everytime I click the button, the subtable opens but then I have to move to the mouse to select the field '1’s - # Bundles (#25)'. Is there anyway to code it so that when the button is clicked, that field is selected so I can stay on the keyboard?

Thank you for your time!

Michael