Binaryworld - Change a CheckBox or OptionButton style at runtime ... [ VB -> Forms & Controls ]

Visual Basic doesn't let you change the Style property of a CheckBox or an OptionButton control at runtime. However, you can easily do it by manipulating the control's style bit, with the SetWindowLong API function. Here's a routine that does the trick:

Using the routine is straightforward. For example, this code changes the style of all the OptionButton controls in the Option1 array

Click here to copy the following block

Dim c As Control
  For Each c In Option1
    SetButtonStyle c, True
  Next

Click here to copy the following block

Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" _
  (ByVal hWnd As Long, ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" _
  (ByVal hWnd As Long, ByVal nIndex As Long, ByVal newValue As Long) As Long

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

Sub SetButtonStyle(Ctrl As Control, ByVal Graphical As Boolean)
  If Graphical Then
    SetWindowLong Ctrl.hWnd, GWL_STYLE, GetWindowLong(Ctrl.hWnd, _
      GWL_STYLE) Or BS_PUSHLIKE
  Else
    SetWindowLong Ctrl.hWnd, GWL_STYLE, GetWindowLong(Ctrl.hWnd, _
      GWL_STYLE) And Not BS_PUSHLIKE
  End If
  Ctrl.Refresh
End Sub