Preventing a Command Button from getting Focus

This code, which was not written by me, will prevent a command button from receiving the focus (The box with dashed lines on command button).

VB Code:

'In a Module
Option Explicit
 
Public Declare Function SetWindowLong Lib "user32" _
                                        Alias "SetWindowLongA" _
                                        (ByVal hwnd As Long, _
                                        ByVal nIndex As Long, _
                                        ByVal dwNewLong As Long) As Long
 
Public Declare Function CallWindowProc Lib "user32" _
                                        Alias "CallWindowProcA" _
                                        (ByVal lpPrevWndFunc As Long, _
                                        ByVal hwnd As Long, _
                                        ByVal uMsg As Long, _
                                        ByVal wParam As Long, _
                                        ByVal lParam As Long) As Long
                                            
Public Const GWL_WNDPROC            As Long = (-4)
Private WndProcOrig                 As Long
 
Public Function BtnWndProc(ByVal hwndBtn As Long, _
                            ByVal wMsg As Long, _
                            ByVal wParam As Long, _
                            ByVal lParam As Long) As Long
    
    If wMsg = 7 Then
        BtnWndProc = 0
        Exit Function
    Else
        BtnWndProc = CallWindowProc(WndProcOrig, hwndBtn, wMsg, wParam, lParam)
    End If
End Function
 
Public Sub SubClassBtn(ByVal hwndBtn As Long)
    WndProcOrig = SetWindowLong(ByVal hwndBtn, GWL_WNDPROC, AddressOf BtnWndProc)
End Sub
 
Public Sub UnSubclassBtn(ByVal hwndBtn As Long)
    Call SetWindowLong(hwndBtn, GWL_WNDPROC, WndProcOrig)
    WndProcOrig = 0
End Sub

and then you call it like this:

VB Code:

'On the form
Option Explicit
 
Private Sub Form_Load()
Dim a As Long
    With Command1
        For a = .LBound To .UBound
            SubClassBtn .Item(a).hwnd
        Next a
    End With
End Sub
 
Private Sub Form_Unload(Cancel As Integer)
Dim a As Long
    With Command1
        For a = .LBound To .UBound
            UnSubclassBtn .Item(a).hwnd
        Next a
    End With
 
End Sub