Just a few additional notes:
If you want to be sure to interpret a number in a field as a number, you can alternatively use "myfield.data" instead of "myfield.text"; this will ask Decker to interpret the contents of the field as LOVE (a JSON superset).
You can also set the selected .row and .column property of a grid at the same time using ".cell":
myGrid.cell:("price",3)