Rank 1
Internet Explorer version 8
Windows Server 2008
I had regular SilverLight TreeView controls. I replace one of them with the Telerik TreeView control. This one in particular had no event hook-ups. I wanted to disable the expanding and collapsing of nodes so that the control will always stay expanded. I hooked into two events as the coded example:
| <telerik:RadTreeView x:Name="tvMDocs" PreviewExpanded="tvMDocs_PreviewExpanded" PreviewCollapsed="tvMDocs_PreviewCollapsed" /> |
The code behind is as the following:
| private void tvMDocs_PreviewExpanded(object sender, Telerik.Windows.RadRoutedEventArgs e) |
| { |
| e.Handled = true; |
| } |
| private void tvMDocs_PreviewCollapsed(object sender, Telerik.Windows.RadRoutedEventArgs e) |
| { |
| e.Handled = true; |
| } |
I have the break points set to stop at the "e.Handled = true". I am assuming that the events are not firing because it does not stop at these points. Any suggestions to why this isn't working would be greatly appreciated.
Steve
4 Answers, 1 is accepted
This is indeed unexpected. Do you mean that the user can still collapse an item?
Is it possible that handling the PreviewExpanded event cancels out a possible ExpandAll() call?
You can have a look at the attached project where this seems to work. Am I missing something?
Kind regards,
Miroslav
the Telerik team
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Rank 1
Miroslav,
Yes, your little project works fine. I can set a break point at the "e.Handled = true;" and the debugger does stop at the break point.
This is very straight forward code and almost identical to my code except that I do not have the TreeViewItems hard coded in the xaml. The treeview items are built in code behind using the directory structure and files from SharePoint sites. I set each item's "IsExpanded" as they are added to the tree. The other difference is that the treeviews are in two seperate RadTiles which shouldn't make a difference on the firing of the events. As I said in my original question, I am fairly sure that the PreviewCollasped and PreviewExpanded are not fiiring back to my code behind because they don't stop at the breakpoints in my code.
I am going to try an experiment by making a small hard coded Treeview as per your sample code, within my page and see if that works. My concern is that perhaps the code I am using to load my Treeview is not loading it correctly even though it displays correctly and thus the events don't fire. I will let you know how this goes.
Steve
Rank 1
I guess I am at square one. I can make a new tile and cut and paste your sample xaml with an event code-behind function and
it works. I think I am probably going to have to recode the recursive logic that I was using to fill the SilverLight 4 Treeview Control
because there must be some difference in how I should be filling it. I will look on your site at sample code and try to rework this.
I will let you know how I solve it but it may take me a while.
Steve
This is indeed strange. Can you send us a sample project where the events are not fired?
If you will be displaying a file-folder system, it may be best to databind the TreeView and use virtualization since it will scale much better. I tried the always-expand in this scenario as well, you can check out the attached project.
Which version of the controls are you using?
Greetings,
Miroslav
the Telerik team
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