Very wierd behaviour with Treeview Control

[Arokh]

Hi

 

I'm having trouble with the TreeView Control:

I sometimes want to add nodes or edit them but it seems to do both sometimes

which of course messes up its content.

 

What is really odd:

This only happens when the Treeview is visible.

If I place it on a TabControl, on a Tab which is not viewed it works exactly as I want it to,

but as soon as I switch to the tab which contains the Treeview, it messes up again.

 

First I thought something is wrong with my code but I reduced the code to the base problem but it still happens:

Public Class Form1
   Delegate Sub CrossThread(ByVal J As Integer)
   Dim ItemAdder As New Threading.Thread(AddressOf ItemAdd)

   Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
       ItemAdder.Start()
   End Sub

   Private Sub ItemAdd()
       For J As Integer = 0 To 100
           For I As Integer = 0 To 1
               AddNode(J)
               Threading.Thread.Sleep(500)
           Next
           Threading.Thread.Sleep(500)
       Next
   End Sub

   Private Sub AddNode(ByVal J As Integer)
       With TreeView1
           If .InvokeRequired Then
               Dim AddNodeSub As CrossThread = AddressOf AddNode
               .Invoke(AddNodeSub, J)
               Exit Sub
           End If

           If .Nodes.Count - 1 < J Then
               .Nodes.Add(New TreeNode(J & " BlaBla"))
           Else
               Dim Node As New TreeNode(J & " BlaBla")
               Node.Nodes.Add(New TreeNode("SubNode1"))
               Node.Nodes.Add(New TreeNode("SubNode2"))
               .Nodes(J) = Node
           End If
       End With
   End Sub
End Class

 

I've also attached the Project.

Start it up wait some seconds and switch to the second tab,

everything is correct until then but as the next nodes are added it messes up.

If you restart it again and immediately switch to the second tab, it messes up from the beginning.

TreeView.zip

[snarfblam]

Try calling TreeView.BeginUpdate() before you begin modifying the TreeView and calling TreeView.EndUpdate() when you are done.

[Arokh]

Added it, but didn't solve the problem