Userform Option Button to Show/Hide Another Option Button on same Userform

Hi All,

I have a userform that has two checkboxes - 'OBTCL' & 'OBNAS'. When the value of 'OBTCL' is true I would like it to show an Option Button 'OBLabel'. If false then hide 'OBLabel'
All the above are on the same userform - 'UserForm1'.

I have tried the following:

Sub UserForm1_Initialise()

UserForm1.Me.Controls("OBLabel").Visible = False

    If OBTCL.Value = True Then
        UserForm1.Me.Controls("OBLabel").Visible = True
    Else
        If OBNAS.Value = True Or OBTCL.Value = False Then
            UserForm1.Me.Controls("OBLabel").Visible = False
        End If
    End If

End Sub

The above still shows 'OBLabel. I'm also not sure if i have put the code in the correct Sub, 'UserForm1_Initialise'?

Any help on the above would be appreciated as always.
Cheers,
Mark