Header Item Click Issue in UI for Silverlight

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Header Item Click Issue

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This is a migrated thread and some comments may be shown as answers.

Richard asked on 08 Dec 2012, 11:41 AM

This is a difficult one to describe and I can't provide a project as the issue is intermittent.

I have a number of menus through out my project, some use data binding and some a straight xaml. All of them at some time and with increasing frequency are experiencing what I think is a bug.

When I click on the header menu item to open the menu as a dropdown it seems to automatically click one of the menu items.
For example I have a menu of 10 items, sometimes clicking this menu does not open the menu , it randomly selects one of the first 3 items and runs them.

It's almost like the mouse down event opens in the menu and the mouse up event registers as a click on one of the menu items. But it happens so fast you can't see the menu open and close.

Any ideas?

Thanks,
Richard

14 Answers, 1 is accepted

answered on 10 Dec 2012, 11:20 AM

Hello Richard,

Unfortunately the issue is quite complicated and we have to investigate it further to have fix or even good workaround. As you have said it is intermittent and debugging it is quite a difficult task. But you can try using Dispatcher or DispatcherTimer in your application instead of Timer, this could do the trick for your case. If you are already using DispatcherTimer, could you send us a small part of the code where it is declared and used? Also code of the Tick event handler will be very helpful.

Thanks in advance for your help and understanding.

Kind regards,
Rosen Vladimirov
the Telerik team

Explore the entire Telerik portfolio by downloading Telerik DevCraft Ultimate.

answered on 10 Dec 2012, 11:35 AM

Hi Rosen,

This is on the Main silverlight page for the whole application, the pages with the menu's are content pages within this page.

Here is a snippet of the dispatch timer getting declared and started along with the tick event. The tick event checks the server for some user messages and pops these up as toast notifications. Please let me know if you spot something wrong in there.

Cheers,
Richard

private readonly TimeSpan _checkForNewEventsSchedule = new TimeSpan(0, 0, 0, 30);

private DispatcherTimer CheckForNewEventsTimer { get; set; }

public MainPage()

{

// Set the Current Telerik Theme

StyleManager.ApplicationTheme = new Windows7Theme();

InitializeComponent();

CheckForNewEventsTimer = new DispatcherTimer { Interval = _checkForNewEventsSchedule };

CheckForNewEventsTimer.Tick += CheckForNewEventsTimerTick;

CheckForNewEventsTimer.Start();

}

void CheckForNewEventsTimerTick(object sender, EventArgs e)

{

if (!NetworkInterface.GetIsNetworkAvailable()) return;

if (LoggedInUser != null && Application.Current.IsRunningOutOfBrowser)

AdminProxy.GetUsersMessagesAsync();

}

answered on 11 Dec 2012, 09:46 AM

Hello Richard,

We think we can offer you a workaround that should fix your problem. First of all change the DispatcherTimer with Timer as the DispatcherTimer is working on the UI Thread, so with your code on each 30ms the UI Thread is blocked to do some operations. The other thing you should do is using Dispatcher in your CheckForNewEventsTimerTick - for example you can wrap this code:

if (LoggedInUser != null && Application.Current.IsRunningOutOfBrowser)

AdminProxy.GetUsersMessagesAsync();

in Dispatcher.BeginInvoke(...).

Could you try this in your application and inform us if it helps? Looking forward to hearing from you.

Kind regards,
Rosen Vladimirov
the Telerik team

Explore the entire Telerik portfolio by downloading Telerik DevCraft Ultimate.

answered on 15 Jan 2013, 11:01 AM

Hi Rosen,

I'm still having this same issue regardless of how I set up the timer. However , I do have some more information on it.

My page looks like

---------------------------------

Tool Bar | Item 1 | Item 2 | Item 3

---------------------------------

Grid

-----------------------

With nothing selected in the grid I can click the tool bar menus and it works ok.

If I select some rows, especially if I select all rows, and click the tool bar, 90% of the time I get the phantom menu item click issue.

It's driving me (and my users) crazy, have you any more ideas?

Cheers,

Richard

answered on 17 Jan 2013, 09:26 AM

RadMenu-SL-OOB-638245.zip

Hello Richard,

On each 30 seconds you are blocking the UIThread to do some action and if you click on RadMenuItem at this time, you will receive this unexpected behavior. I would suggest you to use only Timer (not DispatcherTimer), to get the data which you have to place in the UI, and after GetUserMessagesAsync() is completed, to update your UI (you should use Dispatcher.BeginInvoke to do it). I'm attaching a simple project where you will notice that using a DispatcherTimer is causing the problem, but using Timer only is working.

Hopefully this helps.

Regards,
Rosen Vladimirov
the Telerik team

Explore the entire Telerik portfolio by downloading Telerik DevCraft Ultimate.