GridViewCell GotFocus LostFocus memory issue

[Mike McDougall]

I am loading up a grid with 60 rows and about 40 columns.  I am not doing anything special except binding to some csla objects.  I have set the grid to readonly and Autogenerate columns.  I have two issues.

1.  The vertical scroll is really slow.

2. There seems to be a memory leak.  When I put the control in the content pane of another control and then remove it and add it back as you might do with a tabbed interface the memory continuasly spins up.  I have replaced the control with the plain silverlight grid with the same scenario and there are no memory issues.   When run in Silverlight spy I can see in the Event Monitor that GridViewCell lostFocus and GotFocus get called almost 1000 times within 3 seconds!  Keep in mind I have registered for no events on this grid.  This seems to happen when I close and remove the containing control? Once the 1000 events get called the memory spins up wildly and performance and navigation go very slow.

Can you run your grid in Silverlight spy and monitor the events please.

Thanks,

Mike

[Hristo]

Hi Mike McDougall,

Sorry for the late response. We are quite busy with our Beta 2 release.
I'm happy to inform you that we have included major virtualization improvements with the beta and hopefully they will address the performance issues.
As for the memory leaks we keep high hopes that all known memory leaks that we are aware of are fixed.

Please download the beta and let us know how you find the grid performance. If you still experience this memory leak  please send us a sample project to test it locally.

Kind regards,
Hristo
the Telerik team

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[sun]

Hi Mike McDougall
   Is ok for the Problem?  I do not know how to faster as GridViewCell GotFocus or LostFocus !
Thanks

[Craig Somers]

Hi,
Just wondering if there are any updates to this issue. We are facing a similar issue when we switch from a tab containg a grid to another tab. If the grid has 100 cells visible, a gotfocus and lostfocus event is fired for each of those cells and it takes almost a second to just leave that tab. We have verified this using Silverlight Spy. We are also running the latest version : 2009.3.1314.1030

[Craig Somers]

Is there a way to suppress the GridViewCell GotFocus and LostFocus events from firing?

[Stefan Dobrev]

Hello Craig,

By default GridViewCell is a tab stop element and this is the reason why you are experiencing this issue. There are a number of ways for you to workaround this. You can create a cell style which sets IsTabStop property to false, but you will lose some of the keyboard navigation features of the grid. Better way to solve this is to focus some element outside of the grid before changing the current tab. If you are using RadTabControl PreviewSelectionChanged event comes in handy:

XAML:

<telerikNavigation:RadTabControl x:Name="TabControl1" PreviewSelectionChanged="RadTabControl_PreviewSelectionChanged" ...>

C#:

private void RadTabControl_PreviewSelectionChanged(object sender, Telerik.Windows.Controls.SelectionChangedEventArgs e)
{
AnyFocusableElement.Focus();
}

Hope this helps,
Stefan Dobrev
the Telerik team

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[Craig Somers]

Thanks! That worked.