Public f_form_a, f_form_b

The use of public variable is a very bad idea. An alternative solution would be to use this code in the Load() of the child form:

Thisform.AddProperty( [oParent], _Screen.ActiveForm )

This is because _Screen.Activeform remains the calling form in the Load(). _Screen.activeform does not change until after the Init() finishes. Then, whenever a new record is added to the grid's RecordSource on the parent form, all that is needed is this code in the child form:

Thisform.oParent.MyGrid.Refresh()

No public variables required.