Error "Can't assign to read-only",Mengganti Style Option/CheckBox Saat Runtime VB6

Berikut ini adalah cara mengganti setting property Style pada Option/Checkbox pada saat runtime di visual basic 6. Jika Anda pernah mengganti setting property Style Option Button pada saat runtime, Anda pasti mendapat pesan error "Can't assign to read-only", untuk mempraktekannya siapkan :

1. Buat 1 Project baru dengan 1 Form, 1 OptionButton, 1 CheckBox, dan 2 Commandbutton.
2. Copy-kan coding berikut ke editor Module/Form yang bertalian.

'--- Coding di Module...

          Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" _
          (ByVal hwnd As Long, ByVal nIndex As Long) As Long
          Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" _
          (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

          Public Const GWL_STYLE = (-16)
          Public Const BS_PUSHLIKE = &H1000&

          Public Sub SetGraphicStyle(StyleButton As Control, Flag As Boolean)
              Dim curstyle As Long

              Dim newstyle As Long
             
              'Jika control bukan OptionButton atau CheckBox
              If Not TypeOf StyleButton Is OptionButton And _

              Not TypeOf StyleButton Is CheckBox Then Exit Sub 
              curstyle = GetWindowLong(StyleButton.hwnd, GWL_STYLE)
              If Flag Then
                  curstyle = curstyle Or BS_PUSHLIKE

              Else
                  curstyle = curstyle And (Not BS_PUSHLIKE)
              End If
              newstyle = SetWindowLong(StyleButton.hwnd, GWL_STYLE, curstyle)
              StyleButton.Refresh

          End Sub
          '--- Batas coding di Module... 

          '--- Coding di Form...

          Private Sub Command1_Click()
            Call SetGraphicStyle(Option1, True)
            Call SetGraphicStyle(Check1, True)
          End Sub


          Private Sub Command2_Click()
           Call SetGraphicStyle(Option1, False)
           Call SetGraphicStyle(Check1, False)
          End Sub

          '--- Batas coding di Form...

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