Microsoft KB Archive/175533

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Article ID: 175533

Article Last Modified on 6/24/2004


  • Microsoft Visual Basic 5.0 Professional Edition
  • Microsoft Visual Basic 6.0 Professional Edition
  • Microsoft Visual Basic 5.0 Enterprise Edition
  • Microsoft Visual Basic 6.0 Enterprise Edition
  • Microsoft Visual Basic 4.0 Professional Edition
  • Microsoft Visual Basic 4.0 32-Bit Enterprise Edition

This article was previously published under Q175533


When you change the number of visible buttons on a Toolbar, the Toolbar does not wrap when it should. This problem may occur when adding, removing, or changing the Visible property of buttons on the Toolbar.


The work around is to either resize the form or use SendMessage(Toolbar1.hwnd, WM_SIZE, 0, 0) to force resizing of the Toolbar.


Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.


When using the Add method of the Buttons Collections, wrapping will not occur with the first Button that won't fit but will occur when a subsequent Button is added. Conversely, when using the Remove method, wrapping occurs one Button too soon so that when only one Button remains on the last row, the Toolbar unwraps, placing this last Button off the Toolbar. Changing the Visible property of Buttons never triggers wrapping. The example that follows demonstrates the problem.

Steps to Reproduce Behavior

  1. Create a new Visual Basic project.
  2. Click Components on the Project menu and check "Microsoft Windows Common Controls 5.0."
  3. Add two CommandButtons and a Toolbar control to Form1.
  4. Paste the following code into the form's General Declarations section:

          Option Explicit
          Private Declare Function SendMessage Lib "user32" Alias _
          "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, _
          ByVal wParam As Long, lParam As Any) As Long
          Const WM_SIZE = &H5
          Private Sub Command1_Click()
          Dim I As Integer    ' Make all Buttons visible
          For I = 1 To Toolbar1.Buttons.Count
              Toolbar1.Buttons(I).Visible = True
          Next I
          End Sub
          Private Sub Command2_Click()
          Dim RetVal As Long
          ' If Internet Explorer 4.0 is installed, you must repeat the
          ' following SendMessage line, so that the message is sent twice.
          RetVal = SendMessage(Toolbar1.hwnd, WM_SIZE, 0, 0)  ' Wrap
          ' If placing another control on the Toolbar, set it's Left and ZOrder
          ' properties after the SendMessage.  For a demonstration of this,
          ' see "Example" under "Toolbar Control" in On Line Help.
          End Sub
          Private Sub Form_Load()
          Dim I As Integer
          Dim btnX As Button
          Me.Width = 4200     ' So that 15 buttons won't fit
          Me.Height = 3000    ' So that Command buttons will fit
          Toolbar1.Wrappable = True
          For I = 1 To 15     ' Add more buttons than will fit
              Set btnX = Toolbar1.Buttons.Add(, , , tbrDefault)
              If I > 5 Then btnX.Visible = False  ' Start with 5 buttons
              If I Mod 5 = 0 Then ' Make Groups of 5 (Optional)
                  Set btnX = Toolbar1.Buttons.Add(, , , tbrSeparator)
              End If
          Next I
          ' Place and size Command buttons so that Toolbar1 has room to wrap
          With Command1
            .Width = 2000
            .Caption = "Add Buttons"
            .Left = 200
            .Top = (Toolbar1.Height * 2) + 250
          End With
          With Command2
            .Width = 2000
            .Caption = "Wrap Toolbar"
            .Left = 200
            .Top = Command1.Top + Command1.Height + 15
          End With
          End Sub
  5. Run the project. You will see five blank buttons on the Toolbar.
  6. Click on "Add Buttons." Ten more buttons are made visible but not all will fit. Note that the ToolBar does not wrap.
  7. Click on "Wrap Toolbar." Note that the Toolbar now wraps.

Making more buttons visible than will fit on the Toolbar should cause it to wrap, but the code to do this is not triggered. Resizing the Form will trigger this code, but using the SendMessage API is a better solution because it also works on a Maximized Form.

Additional query words: kbVBp kbdsd kbDSupport kbVBp400bug kbVBp500bug kbVBp600bug kbControl

Keywords: kbbug KB175533