How di I refer dynamically to subform control from popup form

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MS-Access

VBA

i have a sport form called Frm_Sprt_Acnt
it could be called from many subforms
when call it I store the caller subform and its parent and control
Ctr_CallerFormMain
Ctr_CallerFormSub
Ctr_CallerCtrl
how I could return focus to caller control dynamically
I can't get the equivalent of Forms![Frm_TR_Itms_Main]![Frm_TR_Itms_Dtls].Form![TfTrItmDtls_Itm] but dynamically codded

What I have tried:

Public Sub CtrlButClose_Click()
On Error GoTo CtrlButClose_Click_Error

If Nz(Me.Ctr_CallerFormMain, "") <> "" Then
Forms(me.Ctr_CallerFormMain)!Forms(me.Ctr_CallerFormSub).Form.Controls(me.Ctr_CallerCtrl).SetFocus
    ''OK 'Forms!Frm_TR_Itms_Main!Frm_TR_Itms_Dtls.Form!TfTrItmDtls_Itm.SetFocus''OK
End If

DoCmd.Close acForm, Me.Form.Name

    
On Error GoTo 0
Exit Sub
CtrlButClose_Click_Error:
MsgBox "Error " & Err.Number & " (" & Err.Description & ") in procedure CtrlButClose_Click, line " & Erl & "."

End Sub