I just updated all of my Telerik UI for WPF assemblies from 2026.1.415 to 2026.2.520.  It caused two problems.

First, someone apparently forgot to release a corresponding version of the French-specific version of

     Telerik.Windows.Controls.for.Wpf.Xaml

Because now my build tells me that the Telerik NuGet server has no such 2026.2.520 version of

    Telerik.Windows.Controls.for.Wpf.Xaml.fr

So I can either remove that ".fr" version assembly from all my projects or decline to update everything.

Secon -- after I tried to remove that assembly and build --  I started getting all sorts of warnings about CLS-Compliance.  For example, one of my controls exposes this DependencyProperty of type `Telerik.Windows.Controls.ChartSelectionMode`

    public ChartSelectionMode SelectionMode
    {
        get => (ChartSelectionMode)GetValue(SelectionModeProperty);
        set => SetValue(SelectionModeProperty, value);
    }

But with the new release, this code causes the following compiler warning

2>C:\Users\joe\source\repos\Main\Mobile\Modules\Modules.Common\Controls\PlotControl.xaml.cs(372,31,372,44): error CS3003: Type of 'PlotControl.SelectionMode' is not CLS-compliant

I didn't change my code and the type "ChartSelectionMode is just an enum.  I don't understand how this can be happening.  I am getting similar warnings about many such Telerik types.  Including

• Telerik.Windows.Controls.ChartView.SurfaceSeries3DColorizer
• Telerik.Windows.Controls.ChartView.ChartAnnotationDescriptorSelector
• Telerik.Windows.Controls.ChartSelectionMode
  

Did something change in these types?  I know how to disable the warning or put a [CLSCompliant(false)] tag where it needs to go but I would like to understand what changed.

In the 2026.1.415 version I used this Dutch language package: 

Telerik.Windows.Controls.for.Wpf.nl

However I can't find it in the new 20.26.2.520 NOXAML seperate packages zip.

Also I can't find any reference to it on the Documentation site.

Does anyone know where to download this package?

Using the old version gives this error:

Detected package version outside of dependency constraint: Telerik.Windows.Controls.for.Wpf.nl 2026.1.415 requires Telerik.Windows.Controls.for.Wpf (= 2026.1.415) but version Telerik.Windows.Controls.for.Wpf 2026.2.520 was resolved.

We are a Japan-based company developing and selling software that incorporates Telerik UI components.
For export compliance purposes, we have been asked to confirm the Export Control Classification Number (ECCN) of the components used in our software.
Could you please confirm whether the ECCN for Telerik UI for WPF is classified as EAR99?
If it is not EAR99, we would appreciate it if you could provide the correct ECCN classification.

If available, please provide an official or documented classification.

Additionally, we also use Telerik UI for WinForms in some of our products.

Could you please provide the ECCN classification for this product as well?

Thank you in advance for your support.

Hello,
When RectSelectionMode is set to "full," a diagram shape is only selected if the entire shape is within the selection area.
However, for connections, even if only a part of the connection is within the selection area, it gets selected in this mode.
I would like connections to be selected only when their entire length is included in the selection area, just like diagram shapes.
Is it possible to modify RectSelectionMode to achieve this?
If there is any method to enable this behavior, please let me know.

I'm using the RadMultiColumnComboBox control with the GridViewItemsSourceProvider. It's showing a validation error that something "cannot be empty" and I can't get it to go away. Because this control is just used to select a record, I don't want any kind of validation in the grid of any kind. I've tried setting these properties on the bindings for each column:

ValidatesOnDataErrors = false,
ValidatesOnNotifyDataErrors = false,
ValidatesOnExceptions = false,
NotifyOnValidationError = false,

I've also tried setting the grid view's validation mode to none. I've tried setting these properties on the columns:

IsReadOnly = true,
ValidatesOnDataErrors = Telerik.Windows.Controls.GridViewValidationMode.None

Nothing works.

I need a dialog box in WPF where I can select a folder or location in system. I used RadOpenFolderDialog but I also need Opened event handler similar to DialogParameters telerik control.

Need Opened event handler which points to method that will be called when the Opened event of the Window is fired. Please suggest solution for it.

Also if there is any other dialog box telerik control which is suitable for my requirement, suggest me.

I am using TelerikPager with latest version of required nuget package. Setting all required properties like PageSize, Total, ButtonCount, Page, PageChanged. 

On WPF UI, It is showing all pages along with next & previous button but it not showing total page count like "1 - 8 of 24".  Need suggestion or help to resolve this issue.

                <TelerikPager PageSize=""
                              Total=""
                              ButtonCount=""
                              Page=""
                              PageChanged=""
                              ShowInfo="true"></TelerikPager>

Hello,

I'm using Telerik for WPF, version 2020.1.218, and I am using  RadGridView with filters. One of the colums is a Date type, and when I am changing the culture in order to translate the application, the filter is correctly translated. However, if I click on the calendar icon to select the date, that component is not being translated. Is this a bug?

Kind regards,

Román.

Hello Telerik Team,

I am currently working with TreeListView in a WPF application and I am facing an issue related to row background color overriding when a row is selected.

In my application, certain rows need to have a custom background color depending on their type (for example: LocalFile and RemoteFile). The custom color works correctly when the row is not selected.

However, when the row is selected, the default RadTreeListView selection background color overrides the custom color, and the File-specific color is no longer visible.

My goal is to preserve the custom background color when the row is selected.

Below is a simplified version of the style currently used:

<Grid.Resources>
 
    <​Style TargetType="telerik:TreeListViewRow">
 
        <!-- Default row color based on data -->
        <Setter Property="Background">
            <Setter.Value>
                <Binding Path="FileSource">
                    <Binding.Converter>
                        <converter:SourceTypeToColorConverter/>
                    </Binding.Converter>
                </Binding>
            </Setter.Value>
        </Setter>
 
        <Setter Property="MouseOverBackground" Value="LightBlue"/>
 
        <​Style.Triggers>
 
            <!-- Default selected row color -->
            <Trigger Property="IsSelected" Value="True">
                <Setter Property="Background" Value="LightBlue"/>
            </Trigger>
 
            <!-- Selected color for local files -->
            <MultiDataTrigger>
                <MultiDataTrigger.Conditions>
                    <Condition Property="IsSelected" Value="True"/>
                    <Condition Binding="{Binding FileSource}" Value="LocalFile"/>
                </MultiDataTrigger.Conditions>
                <Setter Property="Background" Value="LightGreen"/>
            </MultiDataTrigger>
 
            <!-- Selected color for remote files -->
            <MultiDataTrigger>
                <MultiDataTrigger.Conditions>
                    <Condition Property="IsSelected" Value="True"/>
                    <Condition Binding="{Binding FileSource}" Value="RemoteFile"/>
                </MultiDataTrigger.Conditions>
                <Setter Property="Background" Value="LightYellow"/>
            </MultiDataTrigger>
 
        <​/Style.Triggers>
 
    <​/Style>
 
</Grid.Resources>

The issue occurs when the row becomes selected. The control applies the default selection background, which overrides these custom styles.
Could you please advise on the recommended way to maintain custom row background colors for specific items even when they are selected in TreeListView?
Any guidance or best practice would be greatly appreciated.
Thank you.