BUG: Toolbar Does Not Wrap Correctly

MORE INFORMATION

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.