I 'm problem in ControSource in using Column at the Grid!
When my_field is numeric field in the table.

Column1.ControlSource="str(my_field,5,2)"

It can shows the data in the grid, But

Column1.ControlSource="myfun(my_field)"

function myfun()
parameter par
return par*10

or

function myfun()
parameter par
return str(par,5,2)

There is no data shows in the grid.
Please help me! Than you!