The operating system region and language needs to be set to Japanese.
RichTextBox seems to have several issues with Japanese, but being locked from visibility or edit is the biggest one.
To recreate, start typing in Japanese, push the "right" arrow after selecting the IME option desired, then hit "spacebar." This seems to duplicate the text, then when trying to continue to type into the text field the text is no longer visible (yet the IME does display).
The native WPF RichTextBox has no issues (and also supports partial selection, etc.).
I've attached a video to show the behavior with 2025 Q1 telerik.
*note:* This is on a machine with NVIDIA graphics. I mention this as there may be some issues with RichTextBox and the hardware... When I'm in a virtual machine with a completely Japanese environment and virtual graphics driver, there is NO text visible at all when trying to type into the RichTextBox. Works fine with other controls and wpf RichTextBox.
We can provide support for filtering files that do not have an extension.
MF_E_SHUTDOWN error occurs in some cases when the camera MediaFoundation resources get released. This may happen on unloaded or initialized of the RadWebCam control.
Here is one of the exception stacktraces that may be observed:
Description: The process was terminated due to an unhandled exception.
Exception Info: System.Exception: Stop failed: MF_E_SHUTDOWN
at Telerik.Windows.MediaFoundation.MediaFoundationHelper.ThrowOnHResultError(HResult hr, HResult expected, String message)
at Telerik.Windows.MediaFoundation.BaseMediaFoundationPresenter.StopSession()
at Telerik.Windows.Controls.RadWebCam.<Stop>b__38_0()
Currently, the DataFormatString property of the columns is applied only to the top-level rows and not to the child ones.
To work this around, create a new DataTemplate for the CellTemplate property of the column and set the StringFormat property of the Binding instance for the element that will be used to display the cell's value in view mode.
<telerik:GridViewDataColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding MyPropertyValue, StringFormat=N2}"/>
</DataTemplate>
</telerik:GridViewDataColumn.CellTemplate>
NullReferenceException occurs when the the automation peers creation for the rows goes over 10,000 peers (the MaxCachedPeersSize setting of the GridViewDataControlAutomationPeer). The exception occurs only when the 'record' modifier is used in the class definition. For example:
public record class MyClass(int Id)
{
}The exception stacktrace is:
System.NullReferenceException: 'Object reference not set to an instance of an object.'
peer was null.
Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Automation.Peers.GridViewDataControlAutomationPeer.ClearPeer(Telerik.Windows.Automation.Peers.DataItemAutomationPeer peer) Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Automation.Peers.GridViewDataControlAutomationPeer.GetOrCreateItemPeer(object item, int index) Line 288 C# Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Automation.Peers.GridViewRowAutomationPeer.FindDataItemAutomationPeer(System.Collections.Generic.List<System.Windows.Automation.Peers.AutomationPeer> childPeers) Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Automation.Peers.GridViewRowAutomationPeer.GetChildrenCore() .
To work this around use the "class" modifier instead of "record". For example, instead of:
public record class MyClass(int Id)
{
}Use:
public class MyClass
{
public int Id { get; set; }
}Or alternatively, increase the MaxCachedPeersSize value.
This is observed when using a different culture, for example, "ar-EG".
In the following example, the beginning of the first single line comment is considered a multiline comment start, but since nothing closes it, the entire text is tagged and colored as a comment.
// ***********************************************************************
// some other content here
// some other content here
// ***********************************************************************
public class TestClass
{
}
Generally, this is present because while the distinct values are generated, we check for the Date property in each row, however, when it reaches a row that has a DBNull.Value value, an exception is thrown because the Date property cannot be found in null.
Workaround:
Create a custom provider with a custom source, and on the GetTile method of the custom source, you can override the query to contain the language parameter.
NullReferenceException is thrown when the RadVirtualKeyboard control gets loaded, but it is not added to the visual tree. This skips the initialization of an internal collection which is used on Loaded, thus throwing the error.
To work this around, you can manually call the OnApplyTemplate method of RadVirtualKeyboard before it gets loaded.
virtualKeyboard.OnApplyTemplate();