Last Updated: 23 May 2019 11:12 by ADMIN
System.ArgumentNullException(Value cannot be null) is thrown when item from the listview is selected and the groups are expanded/collapsed.
Last Updated: 23 May 2019 07:54 by ADMIN
QSF DataGrid CRUD example
When editing the value inside the OrderDate column, the edited value is not presented in the OrderDate column. It keeps the old value
In Development
Last Updated: 23 May 2019 07:34 by ADMIN

When starting an app that contians a RadDataGrid in the initial page, an exception is thrown because the telerikfont.ttf file is left unregistered.


Access anything from the TelerikFont class before the InitializeComponent of the page:


In Development
Last Updated: 22 May 2019 14:05 by ADMIN
Created by: Safan
Comments: 0
Category: TreeView
Type: Bug Report
If the control is not yet visualized on the screen and the method is invoked an exception is thrown.
In Development
Last Updated: 22 May 2019 13:46 by John

The RadCalendar DayView.EventView get stuck in a shifted position. This only occurs on iOS.


Steps to reproduce:

1. Load calendar.

2. Slowly slide the event view (lower portion) either right or left until the time labels (1am, 2am, etc.) are no longer in their starting positions.

3. Without releasing the scroll, tap the button to change the view to Month view mode.

4. Tap the button to change back to Day view mode.

5. Observe that the entire events view is still shifted and will remain so until the RadCalendar control is destroyed and a new one is created.


Attached are pictures showing the correct view and the incorrect view. Also, a sample project is attached that can be used to replicate this issue.

I have attempted to use a custom renderer to manually reset the events view, but nothing seems to work.

Last Updated: 22 May 2019 13:41 by Bartosz
SlideView item does not update after navigation between pages
In Development
Last Updated: 22 May 2019 13:09 by ADMIN
Created by: Shalin
Comments: 0
Category: ListView
Type: Bug Report
ListViewTextCell is not centered vertically on Android
In Development
Last Updated: 22 May 2019 11:34 by ADMIN
NullReferenceException is thrown on item property change when ItemStyleSelector is applied
Last Updated: 22 May 2019 10:42 by ADMIN
Created by: Francis
Comments: 0
Category: UI for Xamarin
Type: Bug Report

the following exceptions occur when upgrading to Xamarin.Forms v 4.0:

System.NotSupportedException: Unable to activate instance of type Telerik.XamarinForms.DataControlsRenderer.Android.ListView.TemplateCellContainer

System.NullReferenceException: Object reference not set to an instance of an object
  at Telerik.XamarinForms.InputRenderer.iOS.SegmentedControlRenderer.OnElementDetached

Last Updated: 21 May 2019 22:58 by Anthony
Release R2 2019


On Android, I am using a DataTemplateSelector and a DataTemplate that has a switch on it that the user can press. When the user presses the switch the ListView starts corrupting the data in the list. The item being interacting with starts appearing in other locations on the list.

This issue can be reproduced in the Telerik SDKBrowser project.

Select the following : ListView -> Cell Types -> Template Cell Selector - Xaml

Mark Item1 as special using the button. Scroll down and you will see that an item in the list has been replaced by Item 1 which is now in the list twice.




In Development
Last Updated: 21 May 2019 15:09 by ADMIN
Java.Lang.IllegalStateException (ViewHolder views must not be attached when created) is thrown when the RadListView is inside ScrollView and LoadOnDemand is enabled.
In Development
Last Updated: 21 May 2019 14:14 by ADMIN
When the collection set as ItemsSource of the TreeView is cleared and new item is added, an exception of type NSInternalInconsistencyException is raised on iOS.
Also clearing the ItemsSource is not reflected in TreeView.
Last Updated: 21 May 2019 10:07 by ADMIN

Flicker can be observed when datagrid is manipulated/updated, or entering in edit mode. One example is tapping on a column header - when there is a column with a HeadetTemplate, the column header flickers. Other example is to double-tap a cell to go in edit mode. Also the behavior can be reproduced when DataGrid TemplateColumn is used.

In Development
Last Updated: 20 May 2019 07:08 by ADMIN

Exception when SDK and User Assemblies are linked: Mono.Linker.MarkException

Exception when none are linked: System.TypeLoadException

In Development
Last Updated: 17 May 2019 13:55 by ADMIN
Created by: Jayd
Comments: 1
Category: Checkbox
Type: Bug Report



I have a radcheckbox whose checked value is set on my view model, it is bound oneway. My View model implements INotify. 

When my viewmodel updates the property, the ui does not update. If i set the mode to TwoWay the ui reflects accordingly. I have a converter linked to this same property on another object hence I can't set TwoWay Binding to achieve this(Not included in the sample). The checkbox will just be displaying a state and never be updated by the user


I have tested on iOS and UWP. Have not verified on Android currently, but will require this in future.

Attached is a sample project.

In Development
Last Updated: 17 May 2019 13:11 by ADMIN
When you have a Picker control inside the popup, and the picker items are shown, the popup is incorrectly repositioned on iOS.
Last Updated: 15 May 2019 13:56 by ADMIN
Release R2 2019
When DayStartTime property is set and the user taps on the first timeslot, the start time inside Create Appointment screen is always 12:00 AM
Last Updated: 15 May 2019 13:53 by ADMIN
Release R2 2019
Created by: Edward
Comments: 2
Category: PdfViewer
Type: Bug Report

I am Lazy Loading a document in a TabViewItem on the RadTabView Control. Here are the steps.


1. My Page opens and I am on my Main Tab.

2. The user has two Bottom Menu Options, one of them is for a view of a Document.

3. The user selects the Document Tab Option, and the I fire an Async operation that Loads a Byte Array that the PDFViewer is bound to. This loads fine. The document successfully loads in the viewer.

4. The user goes back to the Main Tab

5. The user then selects the Document Tab Option again, the Byte Array is already loaded so I do not Load it again in my ViewModel. So, I am not updating the Source Property on the PDFViewer again once it is loaded. I also tried just reloading the document with the same results.

The application just crashes. My guess is the Rendering or Re-Rendering of the Pdf Document between Tab Selections and there is someting 


If the document is never loaded, the app does not crash. However, once I load the document in the PDFViewer that exists on a Tab, the Application will crash if the user moves between tabs.

   Stack Trace from the Native Crash Reporting from the Application Output Window.

at <unknown> <0xffffffff>
at SkiaSharp.SkiaApi:sk_canvas_draw_path <0x000fe>
at SkiaSharp.SKCanvas:DrawPath <0x001f2>
at Telerik.XamarinForms.SkiaSharp.PdfSkiaPathPainter:Paint <0x00b42>
at Telerik.XamarinForms.SkiaSharp.SkiaPainterBase:Paint <0x0010f>
at Telerik.XamarinForms.Common.Painters.Painter:TryPaint <0x00176>
at Telerik.XamarinForms.Common.Painters.Painter:Paint <0x003a2>
at Telerik.XamarinForms.SkiaSharp.SkiaPainter:Canvas_PaintSurface <0x0038c>
at SkiaSharp.Views.Forms.SKCanvasView:OnPaintSurface <0x000bc>
at SkiaSharp.Views.Forms.SKCanvasView:SkiaSharp.Views.Forms.ISKCanvasViewController.OnPaintSurface <0x00076>
at SkiaSharp.Views.Forms.SKCanvasViewRendererBase`2:OnPaintSurface <0x001d5>
at SkiaSharp.Views.iOS.SKCanvasView:DrawInSurface <0x0015c>
at SkiaSharp.Views.iOS.SKCanvasView:Draw <0x005b3>
at <Module>:runtime_invoke_void__this___CGRect <0x003f9>
at <unknown> <0xffffffff>
at UIKit.UIApplication:UIApplicationMain <0x00211>
at UIKit.UIApplication:Main <0x000b2>
at UIKit.UIApplication:Main <0x00222>
at EMMA.FINSM.iOS.Application:Main <0x00092>
at <Module>:runtime_invoke_void_object <0x00178>



Example of my Binding. Very simple Byte Array Binding, and out of the box example from the QSF Code. I also tried using a Stream and it does the same thing.

         <RowDefinition Height="Auto"/>
     <telerikPdfViewer:RadPdfViewerToolbar PdfViewer="{Binding Source={x:Reference PDFView}}">
     <telerikPdfViewer:RadPdfViewer x:Name="PDFView" Grid.Row="1" Source="{Binding Document}" />
public byte[] Document
    get => _document;
        SetProperty(ref _document, value);


Last Updated: 15 May 2019 13:53 by ADMIN
Release R2 2019
The RadPopup is not centered on a UWP device with display scaling different from 100%.
Last Updated: 15 May 2019 13:53 by ADMIN
Release R2 2019
The command does not accept an int as a parameter. It requires the parameter to be string and not to be an index, but a page number.
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