Userform_initialize, select Multipage tab based on which previous userform button pressed?

Hi All,

I am fairly new to userform's so any help would be greatly appreciated.

Scenario - I have two userform's in excel 2013, when a button ("CommandButton3" or "CommandButton5") on the first userform (MasterPage1) is pressed it opens a second userform (Layer12) which contains a multipage. I want to select a certain tab, based on which button was pressed on the previous userform.

my code:

Private Sub UserForm_Initialize()

Select Case Application.Caller
Case "CommandButton3"
'1st tab
Me.MultiPage1.Value = 0
'3rd tab
Case "CommandButton5"
Me.MultiPage1.Value = 3
End Select

End Sub

I have also tried:

Private Sub UserForm_Initialize()

If MasterPage1.CommandButton3.Value = True Then
    Me.MultiPage1.Value = 0
ElseIf MasterPage1.CommandButton5.Value = True Then
    Me.MultiPage1.Value = 3

End If

End Sub

Neither work.
Any suggestions as to where I am going wrong would be appreciated.

Many Thanks,
Jonathan