FIX: ListView & TreeView Not Visible if DragMode is Automatic (150224)


The information in this article applies to:

  • Microsoft Visual Basic Standard Edition, 32-bit, for Windows 4.0
  • Microsoft Visual Basic Professional Edition, 32-bit, for Windows 4.0
  • Microsoft Visual Basic Enterprise Edition, 32-bit, for Windows 4.0
This article was previously published under Q150224

SYMPTOMS

If the DragMode property of the ListView or TreeView controls is set to Automatic, items added to the controls are not visible. This behavior occurs even if the EnsureVisible method is invoked for either the nodes or listitems.

RESOLUTION

When adding new nodes or listitems to the controls, and invoking the EnsureVisible method, set the DragMode property to 0 - Manual. It can be set back to Automatic at the end of the routines to add new items.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been fixed in Visual Basic 5.0.

MORE INFORMATION

Steps to Reproduce Problem

  1. Start a new project in Visual Basic. Form1 is created by default.
  2. Place a ListView and TreeView control on Form1. In the Load event for Form1, place the following code: 
          Private Sub Form_Load()
         Dim x As Node, y As ListItem
         Set x = TreeView1.Nodes.Add(, , , "eat more")
         Set y = ListView1.ListItems.Add(, , "jello")
         x.EnsureVisible
         y.EnsureVisible
      End Sub
  3. Ensure that the DragMode property of both controls is set to 1-Automatic.
  4. Run the project by pressing F5. Note that the item added to both controls shows only partially or not at all.
To correct this problem using the workaround above, change the code in the Load event of the Form to: 
   Private Sub Form_Load()
      Dim x As Node, y As ListItem
      ListView1.DragMode = 0
      TreeView1.DragMode = 0
      Set x = TreeView1.Nodes.Add(, , , "eat more")
      Set y = ListView1.ListItems.Add(, , "jello")
      x.EnsureVisible
      y.EnsureVisible
      ListView1.DragMode = 1
      TreeView1.DragMode = 1
   End Sub
Modification Type:MajorLast Reviewed:6/24/2004
Keywords:kbBug kbControl kbfix kbVBp500fix KB150224
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