Replace msgbox with a form

I am trying to use a form to replace the message box vb provides to be more informative
the current messagebox cannot have a Rename button

the messagebox to replace

If mstrCboText <> cboBids.Text Then 'selected item is different name than typed text
             Select Case MsgBox("Do you want to rename mstrCboText to cboBids.Text click ""Yes""" _
                                & vbCrLf & "To add as as new Catagory click ""No""" _
                                & vbCrLf & "To cancel click""Cancel""" _
                                , vbYesNoCancel Or vbQuestion Or vbDefaultButton1, App.Title)
             
                Case vbYes
                    cboBids.List(mintLI) = cboBids.Text
                    cboBids.ListIndex = mintLI
                Case vbNo
                    cboBids.AddItem cboBids.Text
                Case vbCancel
                   cboBids.Text = mstrCboText ' put back the original text
             End Select

the code for calling the custom form
 Dim iResponse As VBA.VbMsgBoxResult, sPrompt As String
    Dim sCurrSection As String, sTypedText As String
    sCurrSection = mstrCboText
     sTypedText = Me.cboBids.Text
                 
    frmMessTemplate.gOldName = sCurrSection
   
         frmMessTemplate.gNewName = sTypedText
         frmMessTemplate.Show vbModal

I am having trouble handling the return values from the custom form
Eg:
cmdNew
'new combobox item
cmdRename
'rename the current selected item
cmdCancel
'cancel the procudure

I am thinking of making a public sub in the calling form to handle the return value