Knowledge Base

FIX: ListView & TreeView Not Visible if DragMode is Automatic

Article ID: 150224

Article Last Modified on 6/24/2004

Microsoft Visual Basic 4.0 Standard Edition
Microsoft Visual Basic 4.0 Professional Edition
Microsoft Visual Basic 4.0 32-Bit Enterprise Edition

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

Start a new project in Visual Basic. Form1 is created by default.

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

Ensure that the DragMode property of both controls is set to 1-Automatic.
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

Additional query words: kbVBp400bug kbVBp500fix kbVBp kbControl

Keywords: kbbug kbfix kbvbp500fix kbcontrol KB150224