>I want to get values from the active row of a grid. First I wanted to
>get the active row with Grid.ActiveRow, but alike in which row I click
>before the command MESSAGEBOX (STR(THISFORM.gridname.ActiveRow)) returns always 0. Is this a bug or a feature?

It's feature: grid should have focus to have some value in its ActiveRow property. If you want to use it in code, you may shift focus to grid and store this property value in some local variable.