I made a minor modification on your sent sample in order to avoid the issue. Below is the detail of the changes.

TestWebDesktop.aspx

• Add and set the NavigateURL and Target property over the WebTreeViewNode collection.

  Original version:

  <Nodes>
      <ISWebTreeView:WebTreeViewNode Name="node_NewNode1" Text="Home">
          <ISWebTreeView:WebTreeViewNode Name="node_NewNode2" 
              Text="Yahoo" Tag="http://www.yahoo.com/">
          </ISWebTreeView:WebTreeViewNode>
          <ISWebTreeView:WebTreeViewNode Name="node_NewNode4" 
              Tag="http://www.google.com/" Text="Google">
          </ISWebTreeView:WebTreeViewNode>
          <ISWebTreeView:WebTreeViewNode Name="node_NewNode5" 
              Tag="http://www.microsoft.com/" Text="Microsoft">
          </ISWebTreeView:WebTreeViewNode>
      </ISWebTreeView:WebTreeViewNode>
  </Nodes>

  Modified version:

  <Nodes>
      <ISWebTreeView:WebTreeViewNode Name="node_NewNode1" Text="Home">
          <ISWebTreeView:WebTreeViewNode Name="node_NewNode2" Text="Yahoo" Tag="http://www.yahoo.com/"
              NavigateURL="http://www.yahoo.com/" Target="panContent">
          </ISWebTreeView:WebTreeViewNode>
          <ISWebTreeView:WebTreeViewNode Name="node_NewNode4" Tag="http://www.google.com/"
              Text="Google" NavigateURL="http://www.google.com/" Target="panContent">
          </ISWebTreeView:WebTreeViewNode>
          <ISWebTreeView:WebTreeViewNode Name="node_NewNode5" Tag="http://www.microsoft.com/"
              Text="Microsoft" NavigateURL="http://www.microsoft.com/" Target="panContent">
          </ISWebTreeView:WebTreeViewNode>
      </ISWebTreeView:WebTreeViewNode>
  </Nodes>

• Removes OnNodeSelect client-side event of WebTreeView.

  Original version:

  <ClientSideEvents OnNodeSelect="wtvNav_OnNodeSelect" OnInitialize="wtvNav_OnInitialize" />

  Modified version:

  <ClientSideEvents OnInitialize="wtvNav_OnInitialize" />

TestWebDesktop.aspx.vb

• Add and set the ServiceType property and FlyPostBackSettings collection, enable EnableUIMode property.

  Original version:

      Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
  
          listener = New WebFlyPostBackListener(Me)
  
          WebFlyPostBackManager1.ServiceUrl = Request.Url.PathAndQuery
      End Sub

  Modified version:

      Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
  
          listener = New WebFlyPostBackListener(Me)
  
          WebFlyPostBackManager1.ServiceUrl = Request.Url.PathAndQuery
          WebFlyPostBackManager1.ServiceType = ServiceType.WebForm
          WebFlyPostBackManager1.EnableUIMode = True
  
          WebFlyPostBackManager1.FlyPostBackSettings.PostInputControls = True
          WebFlyPostBackManager1.FlyPostBackSettings.PostViewState = True
      End Sub

I utilize the NavigateURL and Target property of WebTreeView in order to avoid the issue when resizing the browser. NavigateURL is a property which will allow you to set the URL when a node is clicked, while the Target property allows you to set in which window the URL will be displayed. You can direct it to an iFrame or even a new window.

By using NavigateURL and Target property, the OnNodeSelect client-side event that is used to execute LoadContent() method is no longer needed.

Hope this helps.

Thanks Yudi.

I tried you suggestion and it does work.

However, as i have stated in my original post. The reason why i load the content using Flypostback and javascript is I want to have the 'loading screen' to inform the user what's going on rather than a blank screen and the content suddenly comes up. As our pages need some time to render

Please see the attached graphic for my expected result.

Many Thanks.

Kenny

I have forwarded the issue to WebDesktop development team.

The issue is filed under work item #838. I’ll keep you updated with any news I heard from the team regarding work item #838.

For your information, during my test, I found out that the Javascript error not persists if the Height and Width property of WebTreeView is not set to “100$ispct;”. In my case, I set the Height and Width with an integer value.

Thank you for your valuable feedback.