Microsoft KB Archive/257792

Knowledge Base

FIX: TreeView NodeClick Events May Fire Despite Cancel = True

Article ID: 257792

Article Last Modified on 8/7/2007

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APPLIES TO

• Microsoft Visual Basic 6.0 Professional Edition
• Microsoft Visual Basic 6.0 Enterprise Edition

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This article was previously published under Q257792

SYMPTOMS

The NodeClick event of a TreeView control can be triggered even when the CausesValidation property of TreeView is True and the control losing Focus sets Cancel to True in the Validate event.

RESOLUTION

To resolve this problem, install the latest service pack for Visual Studio 6.0.

STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article. This bug was corrected in the latest service pack for Visual Studio 6.0.

For additional information about Visual Studio service packs, click the following article numbers to view the articles in the Microsoft Knowledge Base:

194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

194295 HOWTO: Tell That a Visual Studio Service Pack Is Installed

To download the latest Visual Studio service pack, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/vstudio/Aa718353.aspx

MORE INFORMATION

Steps to Reproduce Behavior

1. Create a new Standard EXE project in Visual Basic. Form1 is created by default.
2. On the Project menu, click Components.
3. Add a reference to Microsoft Windows Common Controls 6.0.
4. Place a TextBox control and a TreeView control on Form1.

5. Paste the following code into Form1's code window:

   Private Sub Text1_Validate(Cancel As Boolean)
      Debug.Print "Form1 text1 validate"
      Cancel = True
   End Sub
   
   Private Sub Form_Load()
      Dim nodx As Node
      Set nodx = TreeView1.Nodes.Add(, 2, , "Parent")
      Set nodx = TreeView1.Nodes.Add(TreeView1.Nodes(1), 4, , "Child1")
      Set nodx = TreeView1.Nodes.Add(TreeView1.Nodes(1), 4, , "Child2")
      nodx.EnsureVisible
   End Sub
   
   Private Sub TreeView1_NodeClick(ByVal Node As MSComctlLib.Node)
      Debug.Print "NodeClick " & Node.Text
   End Sub
                       

6. Press the F5 key to run the program.
7. On the View menu, choose the Immediate window.
8. Click on the nodes of the TreeView control, and note that the NodeClick event is fired in the Immediate window.

Additional query words: sp4

Keywords: kbbug kbfix kbtreeview kbvs600sp4fix kbvs600sp5fix KB257792

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