I use the SyntaxEditor (v2024.4.1113.48, but also checked 2025.3.813.462) in WPF and want to show a completion list. As soon as I call

completionWindow.Show();

the completion window is shown for a very short amount of time in the upper left corner of the screen (not at the carret position). And after approx 200ms the exception occurs.

The function is

private void ShowCompletionWindow(RadSyntaxEditor codeEditor, string[] candidates)
 {
     try
     {
         var completionWindow = codeEditor.IntelliPrompts.CompletionListWindow;
         if (completionWindow?.Presenter == null)
         {
             return;
         }

         var completionList = new CompletionInfoCollection();
         foreach (var candidate in candidates)
         {
             completionList.Add(new CompletionInfo(candidate));
         }

         completionWindow.Presenter.CompletionListItems = completionList;

         // Validate caret position once more before showing
         if (codeEditor.CaretPosition.LineNumber >= 0 && codeEditor.CaretPosition.LineNumber < codeEditor.Document.CurrentSnapshot.LineCount)
         {
             completionWindow.Show();
         }
     }
     catch (Exception innerEx)
     {
         _log.Error("Exception showing completion window", innerEx);
     }
 }

This function gets called from TextDocument.TextContentChanged event handler. This might be the reason. I want to type and want to show identifieres, that start with the string that the user started typing.

The exception

 at Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.SetPosition(Point pointInScreen)
   at Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.SetPosition(Point pointInEditorPresenter, Point pointAboveTheCaret)
   at Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.SetPositionInView()
   at System.EventHandler.Invoke(Object sender, EventArgs e)
   at Telerik.Windows.Controls.SyntaxEditor.Layout.SyntaxEditorLayout.OnArrangeExecuted()
   at Telerik.Windows.Controls.SyntaxEditor.Layout.SyntaxEditorLayout.Arrange()
   at Telerik.Windows.Controls.SyntaxEditor.UI.SyntaxEditorPresenter.ArrangeOverride(Size arrangeBounds)
   at System.Windows.FrameworkElement.ArrangeCore(Rect finalRect)
   at System.Windows.UIElement.Arrange(Rect finalRect)
   at System.Windows.ContextLayoutManager.UpdateLayout()
   at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
   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 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

Hi,

I've been working with the RadTreeListView control. I'm very happy with it.

However, I stumbled upon a problem when trying to implement a new feature.

I want to hide the expander button of the "first layer items" (level 0). Technically, it worked by adding a trigger to the GridViewToggleButtonArrowTemplate:

<DataTrigger
	Binding="{Binding RelativeSource={RelativeSource AncestorType=telerik:TreeListViewRow}, Path=Level}"
	Value="0">
	<Setter Property="Visibility" Value="Hidden" />
</DataTrigger>

BUT, this solution leads to a huge gap between the table border and the content of each cell in the first column.

I tried obvious things like applying paddings or margins with negative values or setting the expander button visibility to collapsed instead of hidden. But all of these approaches did not lead me to a consistent solution with a desirable UI. Either, the expander button of child items would not be visible anymore, or there would be a huge indent between level 0 and 1 items.

What I'm trying to achieve is that the expander in level 0 is kind of "wiped out" -> it shouldn't be displayed and there must be no gap. But the expanders for all child items must stay untouched. Therefore, all of the cell content in column 1 would have to be moved to the left by around 20 Px (I guess it's 20 Px, because this is the width of the GridViewToggleButton inside the TreeListViewRowTemplate).

I assume, it's a change which has to be made deeply inside the template. I just couldn't find where yet. All "obvious" approaches didn't lead me to where I wanna get.

Any help is greatly apprexciated!

Best regards,

Alex

Hello everyone,

When I C/P a document from Word to our logiciel I have this crash :

System.ArgumentNullException: La valeur ne peut pas être null. Nom du paramètre : NumStyleLink points to not existing NumberingStyle.

From my little investigations, I've see one points to StyleLink and the other NumStyleLink.

If you have any thoughts I'll be glad to here theses.

Thanks !

Olivier;

Hi,

I am using the RadVirtualKeyboard with German culture. Moreover, I use a custom layout via XML-file.

On the normal German keyboard the @-Button is activated by "Alt Gr"-q. With the RadVirtualKeyboard that does not work. So, where is the @-Button?

As far as I understood, the custom layout just organizes the positions of the buttons, right?

Best regards,

Ferdinand

Dear Telerik Team,

I'm using Radgridview's Distinct values with my customized list, I'm using ServerSideFiltering and I've got the required outputs in my list but when I choose one of them the default filter operator is "ISEQUALTO" I'm trying to change it as Contains but it doesn't work help me with this

example
in my distinct values Filter:

APPLE
ORANGE
BANANA

in my column:
APPLE
APPLE,BANANA
APPLE,BANANA,ORANGE
BANANA

when I choose APPLE, it should return first 3 options in my column

When i choose APPLE and BANANA it should return all of them

Help me with this.

We are using WPF with Prism, MEF, and Telerik controls (PdfViewer and GridView, version 2017.2.503.45). Our application loads multiple tab views dynamically using the MVVM pattern. Each view contains multiple Telerik controls, and their data is bound from the ViewModel.

The issue we are facing is that when a tab is closed, the Telerik controls still hold references to the associated ViewModel, preventing the memory from being released.

We have tried the following approaches while closing the tab:

RadPdfViewer.DataContext = null;

RadPdfViewer = null;

RadGridView.DataContext = null;

RadGridView = null;

We also tried disposing of the Telerik controls, but the memory is still retained by them.

We have also defined the PdfViewer in XAML, but no PDF file was ever loaded into it from the UI. However, even in this case, the XAML view is not being disposed when the tab is closed, and the PdfViewer still holds a reference to the view.

Could you please help us identify how to properly release memory and ensure the controls? 

I have a question about my RadGridView. It contains checkboxes, and I noticed that if I don’t click directly on the checkbox but instead on the element surrounding it, the checkbox disappears and only becomes visible again once I click on another element.

RadGriddView

  AutoGenerateColumns="False"
  CanUserDeleteRows="False"
  CanUserFreezeColumns="False"
  CanUserReorderColumns="False"
  CanUserResizeColumns="False"
  CanUserSearch="False"
  CanUserSortColumns="False"
  GridLinesVisibility="Both"
  GroupRenderMode="Flat"
  ItemsSource="{Binding Items}"
  RowIndicatorVisibility="Collapsed"
  ShowGroupPanel="False"

<t:GridViewDataColumn
    Width="*"
    MinWidth="70"
    Header="Test"
    HeaderTextAlignment="Center">
    <t:GridViewColumn.CellTemplate>
        <DataTemplate>
            <CheckBox
                HorizontalAlignment="Center"
                FontSize="16"
                IsChecked="{Binding Test1}"
                IsHitTestVisible="True"
                Tag="{Binding}" />
        </DataTemplate>
    </t:GridViewColumn.CellTemplate>
</t:GridViewDataColumn>

When I use this t:GridViewCheckBoxColumn, the behavior is not as described above. However, I have to click three times on the checkbox, once before I can set the checkmark in the checkbox.

<t:GridViewCheckBoxColumn
    MinWidth="50"
    DataMemberBinding="{Binding Test1}"
    Header="Test1" />