dbUpdate method of TableGrid object

I have a PageControl on a Form. The form's name is Master.
On Page1 of the PageControl I have a TableGrid1. When I double-click a row in TableGrid1, it opens Form1. Form1 gets its data from DatabaseTable1
On Page2 of the PageControl I have a TableGrid2. When I double-click a row in TableGrid2, it opens Form2. Form2 gets its data from DatabaseTable2
On Form2 I have a button. The button executes a script to copy records from DatabaseTable2 to DatabaseTable1. This works. Records are copied. I've confirmed using DB Browser for SQLite.
The last step in the script executes Master.TableGrid1.dbUpdate so that the records I've copied from DatabaseTable2 to DatabaseTable1 will show up in TableGrid1.
I thought that the dbUpdate method would requery TableGrid1's record-source and displays the new records. This doesn't seem to be happening.
However, when I close Master and open it up again, I see the records in TableGrid1.
Hopefully, I've made myself clear. Any help appreciated. Thanks.