Hi everyone.

I hate to post stacktraces without details on how to replicate, but I'm in one of those "impossible to consistently replicate but get enough error reports that it's starting to drive me insane" kind of situations.  Every so often, I get this unhandled exception that crashes an application with a rapidly updating RadGridView.

System.NullReferenceException: Object reference not set to an instance of an object.
   at Telerik.Windows.Controls.GridView.GridViewCell.UpdateValue()
   at Telerik.Windows.Controls.GridView.GridViewCell.SetCellElement()
   at Telerik.Windows.Controls.GridView.GridViewRow.PrepareCell(GridViewCellBase cellBase, GridViewColumn column)
   at Telerik.Windows.Controls.GridView.GridViewCellsPanel.PrepareCell(GridViewCellBase cell, GridViewColumn column)
   at Telerik.Windows.Controls.GridView.GridViewCellsPanel.GetVirtualizedCell(GridViewColumn column, Boolean createIfNull)
   at Telerik.Windows.Controls.GridView.GridViewCellsPanel.RealizeAndMeasureCells(Int32 startIndex, Int32 predictedLastIndex, Func`2 calculateNextIndex)
   at Telerik.Windows.Controls.GridView.GridViewCellsPanel.UpdateVirtualizedCells()
   at Telerik.Windows.Controls.GridView.GridViewCellsPanel.MeasureOverride(Size availableSize)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.ContextLayoutManager.UpdateLayout()
   at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
   at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()
   at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
   at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
   at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.Run()
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at System.Windows.Application.Run(Window window)
   at APSSGuardianAVL.App.Main()

Posting this in hopes that someone has seen it before, or admins know this is a bug that has been addressed.

Thanks.

Hi,

I have a RadTileList which fills the entire width of the screen. By default it has a right padding (50px I guess which is perfect) and I would like to add the same on the left exactly the same way it's done in the demo app.

But I can't find where it's defined, I'm stuck in my research in RadTileListTemplate # ItemsPresenter

 Thanks,

Rémi.

Hello,

I am attempting to retain the position of the scroll position of the RadGridView depending on the action being performed by the user during a ReBind() event.  I found a solution presented already before but I am having problems implementing it: http://www.telerik.com/forums/scrollviewer-in-radgridview.  It only seems to work intermittently.  Even though the contents and row count are not changing, sometimes the scroll stays perfectly still as expected, sometimes nudges slightly, sometimes jumps 5-10 rows losing focus on whatever the user was doing and confusing them.  Oddly it always seems to work on subsequent Rebind() events unless the user adjusts the scroll position again and the problem begins to repeat.  Is there anything that can be done to prevent or fix this unpredictable ​behavior?

so i have RadScheduleView and RadCalendar, SelectedDate and CurrentDate is bound so when i change the dates in calendar, it will also change in ScheduleView.

here's the problem, i want to make another ScheduleView with the same appointment but when i add it, both ScheduleView's CurrentDate is no longer bound to the SelectedDate, why?

and how can i make a Hourly View Appointment? it's like i want to make the 2nd ScheduleView to Hourly so i have an option to open it from the 1st ScheduleView (Day View). for example when i click the slot/appointment at 1:00 time, i will be able to go to 2nd ScheduleView that have timer 1:10 1:20 ... 1:50 something like that so i can make appointment per-10min.

Hi,

I have RadGridView binded to QueryableEntityCollectionView. I want to sort only items on current page by click on column header, not  full data from server.

I was trying to sort items in GridView_Sorting event, set e.NewSortingState  and e.Cancel = true but without any success. Can't access and sort items from current page.

Any help?

Hi,

I'm having big troubles with the AutoCompleteBox control.

My view has a RadGridView with its ItemsSource binded to an ObservableCollection of objects. One column of this GridView contains an AutoCompleteBox that works well. But this AutoCompleteBox produces the following errors at runtime:

System.Windows.Data Error: 26 : ItemTemplate and ItemTemplateSelector are ignored for items already of the ItemsControl's container type; Type='RadWatermarkTextBox'

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=WatermarkTextBox'. BindingExpression:Path=ActualWidth; DataItem=null; target element is 'AutoCompleteBoxesWrapPanel' (Name=''); target property is 'Width' (type 'Double')​

I found several threads about that. They basically say that it's no big deal, "just ignore it", or disable the errors with a piece of code in the code behind. (http://www.telerik.com/forums/autocomplete-watermark-binding-error)

 My problem is that, it is actually pretty bad for performance. For example, when I'm scrolling horizontally in my GridView, and I get to the column where my AutoCompleteBox is, the GridView freezes for a second, and stops scrolling. That's one thing.

The second thing is, my GridView has the Virtualization turned off for some reasons. That means, when my GridView is rendered, those errors are produced for EVERY line of my GridView, and the application freezes until all errors are outputed. That makes the application unusable when dealing with a big number of lines (1000 to 10 000 in my case).

Has anyone fixed this issue somehow ?

Thanks.

Hi,

 I'm surely doing something wrong, but I can't get the content of the BusyIndicator to display. This is what I have:

 <Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApplication1"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <telerik:RadBusyIndicator IsBusy="False">
        <TextBlock>Hello there</TextBlock>
    </telerik:RadBusyIndicator>
</Window>

When running the app a blank window comes up. Removing the busy indicator shows "Hello there".

What am I doing wrong?

Thanks,

Adrian

p.s.: I'm running the 2015.3.930.45 version of the controls

Hi there,

I have a grid where I'm setting the first column frozen, hardcoding FrozenColumnCount="1" in the XAML.  I'm also allowing the user to reorder columns, but I don't want them to be able to move a column to the left of the frozen one, so I only ever have that 1 column frozen, is this possible?  Thanks!

Hello, my Version=2015.3.930.45

I'm trying to show a list of items.

With usual ItemsControl it works fine (or any another control) - see pic 4

But with Carousel it shows empty items at the start and at the end.

After control loads up it shows nothing at all (if amount of items is less then ~5) - pic 1

Then I click "right" button and it shows only one item at the end - pic 2

I can scroll through the items to the empty items at the end - pic 3

 If amount of items is greater then 5 - it shows them, but there are still empty items at the beginning and at the end.

I'm setting ItemsSource to an array of my items and there no nulls or anything unexpectable in the array.

Is it only problem of mine?