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We have an app that has RadComboBox controls arranged above some RadNumericUpDown controls. For the RadNumericUpDown controls we have it set up to open a numeric pad on PreviewMouseUp to support both mouse and touch. The issue we have is that when a combobox item is selected that lies over a numericupdown using touch, the numericupdown control receives the focus and activates the numeric pad. This does not occur when using a mouse.

Attached is an example derived from our app that reproduces this behavior. Selecting Pounds or Newtons from the Force combobox using touch will cause a message box to appear.

Is there any way to work around this behavior? It is annoying but not a show-stopper.

Thanks,
Jim

Jim
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 asked on 28 Jan 2026
0 answers
18 views

Hi,

When using RadGridView ExportAndShow method (GridViewExportFormat = Csv or Txt), the first data row is inserted next to column headers, it's missing a carriage return.

ResultGrid.ExportAndShow(GridViewExportFormat.Csv, "fileName.txt", true);

I'm using Telerik.UI.for.Wpf.80.Xaml 2025.4.1321

Camille
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 asked on 26 Jan 2026
1 answer
72 views

We are encountering severe UI thread blocking when using RadOpenFolderDialog during high-volume file operations (concurrent exports).

Technical Findings: After investigating the internal implementation, we identified the root cause in the DialogWindowBase class. Specifically, inside the SetupDialogContent method, the AddWatcher parameter is hardcoded to true.

This forces the underlying DirectoryInfoWrapper to initialize a FileSystemWatcher and unconditionally subscribe to the following events:

  • Changed
  • Created
  • Deleted
  • Renamed

Because our application generates a large volume of file events during export, these subscriptions flood the message pump and hang the UI thread.

The Question: Since AddWatcher is hardcoded, is there a supported way (or a workaround via reflection/subclassing) to:

Override SetupDialogContent to pass AddWatcher = false?

Access the DirectoryInfoWrapper instance post-initialization to manually unsubscribe from these events?

We urgently need to stop this component from listening to file system changes to maintain application responsiveness.

Version: 2024.4.1213.462

Martin Ivanov
Telerik team
 answered on 13 Jan 2026
0 answers
16 views

I have a WPF app with a RadMap and the ability for the user to change the UI language at runtime. This works for the most parts but the MapZoomBar component does not recognize the resetting of the CustomTelerikLocalizationManager class. On application startup it works as expected, but on runtime change it does not.

Is there a method to force a reload? My alternative is to dynamically recreate the MapZoomBar

Renier Pretorius
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Iron
Iron
Iron
 asked on 05 Jan 2026
0 answers
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I have a custom control that uses RadMultiColumnComboBox and when it's used in a dialog window, and the user opens the dropdown, then without clicking on anything else but the X to close the dialog window, the window closes but the drop down stays open. I would like to fix this in the control itself instead of on the screen if possible but everything I try doesn't work. I've tried adding a .CloseDropDown() call to the LostFocus, Unloaded, and even listened for the parent window to close and all of those attempts had no effect. This seems like a bug in the RadMultiColumnComboBox. I do have KeepDropDownOpen set to False.
Shawn
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Iron
 asked on 23 Dec 2025
0 answers
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Hi there,

I recently upgraded from 2024.3.821 to 2025.4.1111 and I found some weird issue when deserializing raddiagram xml.  Attached please see two SerializationInfo strings. Both of them can be deserialized in 2024.3.821 but the one named "diagram serialization info_bad" is not able to be deserialized completely in 2025.4.1111. I found the RadDiagramShape with Id = "7cc7b6c3-1606-453d-a9ab-ebc0bd53b207" is causing issue so I removed it from the SerializationInfo Info and named it "diagram serialization info_good". 

Please help me to check why the RadDiagramShape Id = "7cc7b6c3-1606-453d-a9ab-ebc0bd53b207" will cause issue in 2025.43.1111 since it didn't give me any error or exception.

my code is simple as:

SerializationInfo e1 = SerializationInfo.CreateDiagramInfo(serializationInfo);
RadDiagram.Deserialize(e1);

Thank you

Chao-An
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 asked on 18 Dec 2025
13 answers
368 views
We have recently updated our Telerik libraries to v2012.3.1129.40. While our experience with this is been good in general there seems to be a bug with the way GridViewColumnGroups and Frozen columns interact. One of our screens contains a RadGridView with 3 frozen columns and a lot (>50) of columns that are divided into about 12 groups. Because of the number of columns the users requested we allow them to show/hide the columns on a group by group basis which we have done (we have check boxes to control the visibility of the different groups). This worked fine prior to the upgrade but no longer seems to work correctly.

We can show/hide the groups (by showing/hiding the child columns causing the parent groups to show/hide) as before but if we show a group (either for the first time or after it has been previously hidden) it does not  function correctly when the grid is scrolled horizontally. Instead of scrolling "under" the frozen columns as expected the group header remains stuck against the frozen column while the column headers and the data rows continue to scroll as expected. If I remove the frozen columns the horizontal scrolling works as expected.

This bug means that we are unable to have Frozen columns which is a critical in a grid with so many columns

Thanks,

Murray
Peter
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Iron
 answered on 15 Dec 2025
22 answers
2.0K+ views
Hi Guys,

    I have made it to hide/show value column of a property individually, but does not make it work to show/hide the whole property row(not only the value column, but also the label column). What's more how to hide a whole group?

    You are really appreciated if you could share some code. Thank you very much.
John
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Iron
Iron
 answered on 11 Dec 2025
0 answers
51 views

Hi, I'm working on a project that uses Telerik  version 2016.1.314.45. Right now we're trying to more widely implement Search As You Type. I see in the documentation that there is some sort of object named SearchStateManager, that you can use in order to modify the search. I cannot find the object in my version. But i can find an answer on a stackoverflow post from 2016/09/07, with an image, that seems to have implemented IsSearchWithAccentEnabled.

When was the feature introduced. I was hoping that in my version could implement similar features as seen on the aforementioned image

Adam
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 asked on 10 Dec 2025
0 answers
67 views

Hi,

I have more or less the same issue as in my other question.

I have the column defined like so:

<telerik:GridViewDataColumn
Header="Business Unit"
UniqueName="BusinessUnit"
DataMemberBinding="{Binding BusinessUnit, Converter={StaticResource BusinessUnitToStringConverter}}"
TextAlignment="Center"
Width="60"
CellStyleSelector="{StaticResource BusinessUnitCellStyleSelector}"
IsVisible="False"
IsFilterable="True"
IsReadOnly="True" />

For the top level, everything works as expected.
In the levels below, it seems like the converter isn't run:

The BusinessUnitToStringConverter should grab the description "PI" instead of the actual value of the enum "MuP".

I am on the latest version (2025.4.1111)

Is there a workaround, or will this be fixed in the next version?

 

Thanks and best regards,

Manuel

Manuel
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 asked on 09 Dec 2025
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