Hi,

We have a requirement to have multiple isolated work spaces in our application (which we originally planned to host in RadTabbedWindow tabs).

Each of these work spaces need to have their own RadDocking set up and be navigable.

We are using implicit datatemplates for our MVVM infrastructure and binding ContentControls to viewmodels at runtime and we are having issues with the TabControl/Window datatemplate and the RadDocking framework.

The problems we are having are as follows:
1) When we bind an ObservableCollection of ViewModels to the ItemsSource property of the RadTabControl/RadTabbedWindow and we try to set up RadDocking in the TabControl/Window's ContentTemplate, an exception gets thrown.

Here's our the code:

And here's the exception that gets thrown is as follows:

System.NullReferenceException
  HResult=0x80004003
  Message=Object reference not set to an instance of an object.
  Source=Telerik.Windows.Controls.Docking
  StackTrace:
   at Telerik.Windows.Controls.RadPaneGroup.OnIsInDocumentHostChanged(Boolean oldValue, Boolean newValue)
   at Telerik.Windows.Controls.RadPaneGroup.Telerik.Windows.Controls.Docking.IDocumentHostAware.set_IsInDocumentHost(Boolean value)
   at Telerik.Windows.Controls.RadSplitContainer.PrepareContainerForItemOverride(DependencyObject element, Object item)
   at System.Windows.Controls.ItemsControl.MS.Internal.Controls.IGeneratorHost.PrepareItemContainer(DependencyObject container, Object item)
   at System.Windows.Controls.ItemContainerGenerator.System.Windows.Controls.Primitives.IItemContainerGenerator.PrepareItemContainer(DependencyObject container)
   at System.Windows.Controls.Panel.GenerateChildren()
   at System.Windows.Controls.Panel.EnsureGenerator()
   at System.Windows.Controls.Panel.get_InternalChildren()
   at Telerik.Windows.Controls.ProportionalStackPanel.MeasureOverride(Size availableSize)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
   at System.Windows.Controls.ItemsPresenter.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.Border.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.Grid.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.Control.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
   at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.Border.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.Control.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at Telerik.Windows.Controls.RadDockPanel.MeasureOverride(Size availableSize)
   at Telerik.Windows.Controls.DockingPanel.MeasureOverride(Size availableSize)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at Telerik.Windows.Controls.RadDockPanel.MeasureOverride(Size availableSize)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.Border.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.Grid.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.Control.MeasureOverride(Size constraint)
   at Telerik.Windows.Controls.RadDocking.MeasureOverride(Size availableSize)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
   at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.Grid.MeasureOverride(Size constraint)
   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.Media.MediaContext.Resize(ICompositionTarget resizedCompositionTarget)
   at System.Windows.Interop.HwndTarget.OnResize()
   at System.Windows.Interop.HwndTarget.HandleMessage(WindowMessage msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Interop.HwndSource.HwndTargetFilterMessage(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 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, 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)

2) We have found that we can fix this issue and prevent the NullReferenceException by modifying the code above and adding a RadTabItem wrapper to the ContentTemplate like this:

 The problem, however, is that this makes the entire central pane basically act like a button (see attached picture ), where hovering over the pane changes the color of the entire screen.

 Neither one of these gets us any closer to what we really need: a bindable RadTabbedWindow with a dynamic/templatable/bindable RadDocking setup on each tab.
 
 I would really appreciate any pointers or help on this!
 Thank you so much for your time.

 Tim

I have problem with menu alignment on two another computers with different Windows version but with the same language, the same application.

Our menu is defined in that way:

<telerik:RadMenu Name="mainMenu"
                         VerticalAlignment="Top"
                         HorizontalAlignment="Stretch"                         
                         IsMainMenu="True"
                         FlowDirection="LeftToRight"                          
                         ClickToOpen="True"                          
                         Grid.Row="0" Grid.Column="0">
            <telerik:RadMenuItem Header="Katalog"
                                 SubmenuOpened="RadMenuItem_SubmenuOpened">
                <telerik:RadMenuItem Header="Kategorie">
                    <telerik:RadMenuItem Header="Open"></telerik:RadMenuItem>
                    <telerik:RadMenuItem Header="Refresh"></telerik:RadMenuItem>
                </telerik:RadMenuItem>
                <telerik:RadMenuItem Header="Grupy">
                    <telerik:RadMenuItem Header="Open"></telerik:RadMenuItem>
                    <telerik:RadMenuItem Header="Refresh"></telerik:RadMenuItem>
                </telerik:RadMenuItem>
            </telerik:RadMenuItem>
            <telerik:RadMenuItem Header="Motyw systemowy"
                                 SubmenuOpened="RadMenuItem_SubmenuOpened">
                <telerik:RadMenuItem Header="Crystal Light" IsCheckable="True" IsChecked="{Binding IsCrystalLight, Mode=TwoWay}"/>
                <telerik:RadMenuItem Header="Crystal Dark" IsCheckable="True" IsChecked="{Binding IsCrystalDark, Mode=TwoWay}"/>
                <telerik:RadMenuItem Header="Green Light" IsCheckable="True" IsChecked="{Binding IsGreenLight, Mode=TwoWay}"/>
                <telerik:RadMenuItem Header="Green Dark" IsCheckable="True" IsChecked="{Binding IsGreenDark, Mode=TwoWay}"/>
            </telerik:RadMenuItem>
            <telerik:RadMenuItem Header="Pomoc"
                                 SubmenuOpened="RadMenuItem_SubmenuOpened">
                <telerik:RadMenuItem Header="O programie">
                    <telerik:RadMenuItem.Icon>
                        <Image Source="{telerik:IconResource IconRelativePath=address.png, IconSources={StaticResource IconSources}}" Stretch="None"/>
                    </telerik:RadMenuItem.Icon>
                </telerik:RadMenuItem>
            </telerik:RadMenuItem>
        </telerik:RadMenu>

If I added code to properly align menu on submenu item open like below, the behaviour is also bad.

My code to align submenu:

private void RadMenuItem_SubmenuOpened(object sender, Telerik.Windows.RadRoutedEventArgs e)
        {
            RadMenuItem menuItem = sender as RadMenuItem;
            if (menuItem != null)
            {
                System.Diagnostics.Debug.WriteLine($"menuItem.ActualWidth: {menuItem.ActualWidth}");
                Popup popup = menuItem.ChildrenOfType<Popup>().FirstOrDefault();
                if (popup != null)
                {
                    System.Diagnostics.Debug.WriteLine($"popup.ActualWidth: {popup.ActualWidth}");
                    System.Diagnostics.Debug.WriteLine($"((Grid)popup.Child).ActualWidth: {((Grid)popup.Child).ActualWidth}");
                    popup.Placement = System.Windows.Controls.Primitives.PlacementMode.Bottom;

                    var popupWidth = ((Grid)popup.Child).ActualWidth;
                    var menuWidth = menuItem.ActualWidth;
                    
                    popup.HorizontalOffset = popupWidth - menuWidth;
                }
            }
        }

It looks like it is invalid left to right support or something else.

Please help.

Hello,

I work with Telerik WPF 2016.R3 and since this morning the provider OpenStreetMap doen't work anymore

I check with the site of OpenStreetMap and the request done by the provider with my navigator and it works well but when my application is calling OSM to get tiles it returns an HTTP error 429 : too many requests

This problem only happens since this morning, last week it works perfectly.

All our applications use this provider to show the map, and so all our clients have the problem !

From my first investigations:

- the Telerik provider use HTTP protocol but when using in my navigator it redirects automatically in HTTPS (I don't know if it has an impact)

- I tried to create a new provider using Telerik Map Source of OSM to force the HTTPS but the same HTTP Error 429 happens

- Using Fiddler to check the request I succeed to have a good response when I added a User-Agent Header in the request

- using the latest demo (WPF 2019.R3), in the sample of Provider Bing and OSM, Bing works correctly but not OSM (the same HTTP error 429 happens)

Do you have any idea of what's happening and how to fix it please ?

Thank you

Thomas

PS : I can't update my version of Telerik because there is a very big impact on the map layer management done in v2017.R3 that cannot match our layer management in our application.

I am importing some HTML to RadRichTextBox using HTMLFormatProvider Import.  Some of the font-family values are changing to Arial when viewing the export of HTML or XAML.

This is the import code, where editor is a RadRichTextBox:

This is the HTML being imported:

This is the HTML after import (exported using HTMLFormatProvider).  Notice that Verdana remains the same, but Helvetica and Times New Romans are changed to Arial in the class s_51202CB4:

This is the XAML:

Please let me know if I am missing something here to maintain the correct font families.

Hi,

In my application, I am using SplineSeries in RadCartesianChart.

I am using CategoricalAxis as horizontal axis.

I want to use CategoricalAxis as vertical axis as well.

How can I achieve the same?

Are there plans to support DataFrame as DataSource in your controls?

eg. to bind the DataGrid's ItemsSource with a DataFrame

https://devblogs.microsoft.com/dotnet/an-introduction-to-dataframe/

If I have  a small range the gauge creates duplicate labels (see attachment) note that -1, 0, 2, and 3 are on the gauge twice and  1 is there 3 times. Is there a way to not allow this to happen or make them show numbers after the decimal ex 1.5 1.75 ect...? It is using whatever the default is for tick intervals as I have not set them. 

Thanks!

Hi,
I am using MultipleRowsAndColumnsPanel in my application. 
I am facing some issues with it:
1. Scrolling behaviour is not working
2. When I add new tile in the view, it is not visualized. when I restart the application, all the tiles are visible as expected.
when I call base.MeasureOverride(availableSize) and base.ArrangeOverride(finalSize) methods in my overriden methods, all the newly added tiles display at position 0.

expected behaviour:
1. scrolling behaviour should work on when tiles goes out of view.
2. newly added tile should display on the view at the next position(1st position after last tile view item).

(MultipleRowsAndColumnsPanel  is copied from https://github.com/telerik/xaml-sdk/tree/master/TileView/RestoredTilesToSpanMultipleRowsAndColumns)