I need to know when the data in a TextBox change.

The textbox have a controlsource type mytable.myfield.

The textbox is inside a container, and this inside a grid column.

I change record selected in mytable with a navegation toolbar, then the data in my textbox change correctly.

I need detect the event fire when this change is.

I try textbox.InterctiveChange() and textbox.programaticchange() and they don´t fire.

I try textbox.value_assign() and this work Ok, but it do excesive overload into the system.

Do you know any better solution than textbox.value_assign()?

Thanks.
José Luis.

P.D.: VFP7 Spanish