BUG: ListView & TreeView Not Visible if DragMode is Automatic

• Standard, Professional, and Enterprise Editions of Microsoft Visual Basic, 32-bit only, for Windows, version 4.0

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.

STATUS

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

WORKAROUND

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.

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.

   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