Problems with accessing datasheet subform on a tab control (1 Viewer)

[yahoo]

Hello again experts

Im strugling with accessing a subform via VBA which is placed on another form on a tab control.
So the form Im looking for is called: 'TreeLevels subform'. It is placed on form: FormTagValidation which is on tab control's ("TabCtl0") page - 'Validation'.
Tab control is on form 'FirstStage'.

So to e.g. set focus on FormTagValidation or to set focus on page validation I need to use code:

Forms!FirstStage!FormTagValidation.SetFocus

Forms!FirstStage.TabCtl0.Pages.Item("Validation").SetFocus

Well I cant make it working for 'TreeLevels subform'

My ultimate goal is to apply query to this subform's RecordSource.

cheers