Last Updated: 18 May 2022 06:54 by ADMIN

LongPress is called on element that is already disposed. 

ObjectDisposedException is thrown:

at Telerik.XamarinForms.Common.NativeGestureRecognizer.ToDip
 at Telerik.XamarinForms.Common.GestureListener.OnLongPress



Xamarin Exception Stack: System.ObjectDisposedException: Cannot access a disposed object. Object name: 'Xamarin.Forms.Platform.Android.Platform+DefaultRenderer'. at Java.Interop.JniPeerMembers.AssertSelf (Java.Interop.IJavaPeerable self) [0x00029] in <2e109281f9514c53b44688fd4549adb2>:0 at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeNonvirtualObjectMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x00000] in <2e109281f9514c53b44688fd4549adb2>:0 at Android.Views.View.get_Context () [0x0000a] in <9d68875f5dbd432db5314e1c0d96cb02>:0 at Telerik.XamarinForms.Common.NativeGestureRecognizer.ToDip (System.Single px) [0x00000] in <9f139977bc32402dabe4bb05ac247bb2>:0 at Telerik.XamarinForms.Common.GestureListener.OnLongPress (Android.Views.MotionEvent e) [0x0000c] in <9f139977bc32402dabe4bb05ac247bb2>:0 at Android.Views.GestureDetector+IOnGestureListenerInvoker.n_OnLongPress_Landroid_view_MotionEvent_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_e) [0x0000f] in <9d68875f5dbd432db5314e1c0d96cb02>:0 at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.102(intptr,intptr,intptr)

The issue occurs on the following device:

Android: 12
Manufacturer: samsung
Model: SM-G970U
Last Updated: 13 May 2022 13:34 by Christopher

DataBindingComplete event of the DataGrid should be fired when the associated data (ItemsSource) has been successfully bound to the control or any data operation like Group, Sort or Filter is applied.  Currently the event handler is not called as expected.


Last Updated: 13 May 2022 07:22 by ADMIN
Created by: Jinfeng
Comments: 3
Category: UI for Xamarin
Type: Bug Report
RdBusyIndicator BusyContent data binding does not work. If a string constant is assigned to the     


                IsBusy="{Binding IsBusy}"
                IsVisible="{Binding IsBusy}"
                AnimationContentColor="{DynamicResource BrandPrimaryColor}">
                    <Label Text="{Binding BusyContent}" HorizontalOptions="Center"/>


RdBusyIndicator BusyContent data binding does not work for the above Label inside the "telerik:RadBusyIndicator.BusyContent". If a string constant is assigned to the Text(for example "Loading..."), then it works perfectly.

The view model 100% has the property "BusyContent" with a value. By the way, the IsBusy and IsVisible data binding work fine.   

Last Updated: 12 May 2022 05:47 by ADMIN
when the item is too long and it spans 2 rows in the result view. When user selects this long item and the drop-down is closed, the selected item text is right-aligned in the control. 

Last Updated: 11 May 2022 14:56 by ADMIN
Release R2 2022
Created by: Anbu
Comments: 0
Category: UI for Xamarin
Type: Feature Request
Add linear progress bar which indicates the progress of a task.
Last Updated: 31 Mar 2022 13:59 by ADMIN
Release Release 2021.1.331 (R1 2022 minor release)
With the Telerik UI for Xamarin release 2022.1.222.1 SkiaSharp version was updated to 2.80.3 
but inside the Telerik.UI.for.Xamarin.SkiaSharp NuGet package the SkiaSharp.Views.Forms version is not updated. The version is 1.68.0
Last Updated: 25 Feb 2022 15:23 by ADMIN
Created by: Luiz
Comments: 15
Category: UI for Xamarin
Type: Feature Request
xamarin forms on wpf is now official, https://docs.microsoft.com/en-us/xamarin/xamarin-forms/platform/wpf
we need to support telerik on there aswell..
Last Updated: 19 Jan 2022 13:55 by ADMIN
Release R1 2022
TimePicker allows you to create custom Accept and Cancel commands, still, currently there isn't a way to bind a command parameter and then use it in the corresponding command Execute method.
Last Updated: 19 Jan 2022 13:43 by ADMIN
Release R1 2022
Created by: Andrea
Comments: 5
Category: UI for Xamarin
Type: Feature Request
I think a "SignPad" would be a very nice new feature for XF.
Last Updated: 29 Dec 2021 07:58 by ADMIN
Created by: Robert
Comments: 2
Category: UI for Xamarin
Type: Bug Report

Combobox, selection mode multiple.

Select the third item:


And you get this:

(also note the +1 circle going over the border)


However, set selected items programatically, and you get this:

There's plenty of space in the control.

Open the dropdown:

Still plenty of space, but... the button has disappeared.

Collapse it by clicking somewhere outside the control and you get back to the measurement bug:

Last Updated: 27 Dec 2021 18:24 by ADMIN
Created by: Francisco Manuel
Comments: 8
Category: UI for Xamarin
Type: Feature Request

Do you have plans to develop controls for the UNO platform?


There are other companies that have already stated that they are working on it, for example,  


Last Updated: 09 Nov 2021 13:37 by ADMIN
Created by: Vinu
Comments: 1
Category: UI for Xamarin
Type: Feature Request

Hi Team,

Were are using RadCalendar- Agenda View mode.

In that

a)we have to add an icon in some specific appointments. 
b)We also need a clicked event on that icon  to show a TOOL-TIP with some details in it. 

Have attached a snapshot for your reference.

Please let it know the possibilities



Vinu Priya


Last Updated: 03 Nov 2021 18:12 by ADMIN
Release 2021.2.728 (R2 2021 minor release)
Created by: Vlad
Comments: 23
Category: UI for Xamarin
Type: Bug Report

There seems to be 2 issues with Telerik ui for xamarin and Xamarin.AndroidX.Core versions and newer where A) Linker seems to be failing when set to "Sdk Assemblies Only" on Visual Studio 16.9.0.


The other issue is with Telerik RadListView and same  AndroidX.Core at runtime I am getting the following exception:

System.TypeLoadException: 'VTable setup of type Telerik.XamarinForms.DataControlsRenderer.Android.ListViewAccessibilityDelegateCompat failed'


Please advise

Last Updated: 03 Nov 2021 18:10 by ADMIN
Created by: Luc
Comments: 1
Category: UI for Xamarin
Type: Bug Report

Please refer to this issue: https://feedback.telerik.com/xamarin/1509502-errors-with-latest-versions-of-androidx

Hello this problem seems to be still prevalent in "Release" mode when using the individual libraries as well, in my case I am referencing the lite libraries from telerik nuget (Telerik.UI.for.Xamarin.Input.Lite + Telerik.UI.for.Xamarin.DataControls.Lite 2021.3.915.1).

There are no error when the workaround for this is to set Linking to "None". Project is latest XF with all latest AndroidX libraries: Project targets Android 10 (Q) 

Severity Code Description Project File Line Suppression State
Error Java.Interop.Tools.Diagnostics.XamarinAndroidException: error XA2006: Could not resolve reference to 'Telerik.XamarinForms.Common.GeometryTypeConverter' (defined in assembly 'Telerik.XamarinForms.Primitives, Version=2021.3.915.500, Culture=neutral, PublicKeyToken=null') with scope 'Telerik.XamarinForms.Common, Version=2021.3.915.500, Culture=neutral, PublicKeyToken=null'. When the scope is different from the defining assembly, it usually means that the type is forwarded. ---> Mono.Cecil.ResolutionException: Failed to resolve Telerik.XamarinForms.Common.GeometryTypeConverter
   at Mono.Linker.Steps.MarkStep.HandleUnresolvedType(TypeReference reference)
   at Mono.Linker.Steps.MarkStep.MarkType(TypeReference reference)
   at MonoDroid.Tuner.MonoDroidMarkStep.MarkType(TypeReference reference)
   at Mono.Linker.Steps.MarkStep.MarkCustomAttributeArgument(CustomAttributeArgument argument)
   at Mono.Linker.Steps.MarkStep.MarkCustomAttributeArguments(CustomAttribute ca)
   at Mono.Linker.Steps.MarkStep.MarkCustomAttribute(CustomAttribute ca)
   at Mono.Linker.Steps.MarkStep.MarkCustomAttributes(ICustomAttributeProvider provider)
   at Mono.Linker.Steps.MarkStep.MarkEntireType(TypeDefinition type)
   at Mono.Linker.Steps.MarkStep.MarkEntireAssembly(AssemblyDefinition assembly)
   at Mono.Linker.Steps.MarkStep.InitializeAssembly(AssemblyDefinition assembly)
   at Mono.Linker.Steps.MarkStep.Initialize()
   at Mono.Linker.Steps.MarkStep.Process(LinkContext context)
   at MonoDroid.Tuner.MonoDroidMarkStep.Process(LinkContext context)
   at Mono.Linker.Pipeline.ProcessStep(LinkContext context, IStep step)
   at Mono.Linker.Pipeline.Process(LinkContext context)
   at MonoDroid.Tuner.Linker.Process(LinkerOptions options, ILogger logger, LinkContext& context)
   at Xamarin.Android.Tasks.LinkAssemblies.Execute(DirectoryAssemblyResolver res)
   --- End of inner exception stack trace ---
   at Xamarin.Android.Tasks.LinkAssemblies.Execute(DirectoryAssemblyResolver res)
   at Xamarin.Android.Tasks.LinkAssemblies.RunTask()
Last Updated: 19 Oct 2021 07:36 by ADMIN
Created by: Ben
Comments: 0
Category: UI for Xamarin
Type: Feature Request
I see there are Tokens inside of the AutoComplete but standalone options would be great to have in the Telerik UI for Xamarin suite
Last Updated: 12 Oct 2021 13:43 by ADMIN

The app crashes randomly when scrolling through the images loaded from the tagit app. 
The crash occurs on iPhone SE 2020 iOS 14.8, it doesn't crash every time you scroll through the images, the crash appears randomly.  

crash on iPhone X iOS 14.8

The issue cannot be reproduced on iPhone 12 ProMax iOS 14.8.

Last Updated: 12 Oct 2021 10:07 by ADMIN
Release R3 2021

The App bar background color is gray, and the search bar doesn't look good with this black textcolor and dark gray background color. 

The default SearchBar look on iOS: 

Last Updated: 08 Oct 2021 15:40 by n/a
Release 2020.3.1207 (R3 2020 minor release)

if you look at the .nuspec file for the Telerik.UI.for.Xamarin.Documents.Flow package there is an entry in the 

<framework> assemblies element;

<frameworkAssembly assemblyName=”WindowsBase” targetFramework=””/ >

This is what causes NuGet to drag the WindowsBase assembly in.

 we cannot build the iOS project - we get the following error.

The type 'NotifyCollectionChangedAction' exists in both 'System, Version=, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' and 'WindowsBase, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35'

We are not referencing the WindowsBase assembly directly, but on analyzing the Nuget dependencies we found the following dependency chain;

Telerik.UI.for.Xamarin (2020.3.1106.1) -> Telerik.UI.for.Xamarin.Documents.Flow (2020.3.1019) -> WindowsBase (Framework Assembly)

 it seems that WindowsBase (and PresentationCore which is also included) are not intended for Xamarin iOS or Android applications.


Last Updated: 08 Oct 2021 07:57 by ADMIN

I want to use a sticky header listview. 
I using the following code to render the sticky header list.

XML page code:

<?xml version="1.0" encoding="utf-8" ?>


     Title="{Binding Title}"

        <vm:AboutViewModel />

            <Color x:Key="Accent">#96d1ff</Color>
        <DataTemplate x:Key="ListViewItemTemplate">
                    <Grid Padding="16, 0, 0, 0" BackgroundColor="#F1F2F5" HeightRequest="100">
                        <Label Text="{Binding Name}" TextColor="#6F6F70" FontSize="Small" />
        <DataTemplate x:Key="ListViewGroupHeaderTemplate">
            <Grid HeightRequest="40">
                    <ColumnDefinition Width="Auto" />
                    <ColumnDefinition />
                <Label Margin="0, 12, 0, 6" Text="{Binding }" Grid.Column="1" TextColor="DarkGray" FontSize="Medium" HorizontalOptions="Start" />
        <telerikListView:ListViewGroupStyle x:Key="ListViewGroupHeaderStyle" BackgroundColor="White" />

            <RowDefinition Height="*" />
                ItemsSource="{Binding Cities}"
                ItemTemplate="{StaticResource ListViewItemTemplate}"
                GroupHeaderTemplate="{StaticResource ListViewGroupHeaderTemplate}"
                GroupHeaderStyle="{StaticResource ListViewGroupHeaderStyle}"
                    <telerikListView:PropertyGroupDescriptor PropertyName="Country"/>

                    <telerikListView:ListViewGridLayout HorizontalItemSpacing="5"
                                                        VerticalItemSpacing="5" />





public class City
        public string Name { get; set; }
        public string Country { get; set; }

    public class ViewModel
        public ObservableCollection<City> Cities { get; set; }

        public ViewModel()
            this.Cities = new ObservableCollection<City>()
                new City() { Name = "Barcelona", Country = "Spain"},
                new City() { Name = "Madrid", Country = "Spain"},
                new City() { Name = "Barcelona", Country = "Spain"},
                new City() { Name = "Madrid", Country = "Spain"},
                new City() { Name = "Rome", Country = "Italy"},
                new City() { Name = "Florence", Country = "Italy"},
                new City() { Name = "Florence", Country = "Italy"},
                new City() { Name = "London", Country = "England"},
                new City() { Name = "Manchester", Country = "England"},
                new City() { Name = "Manchester", Country = "England"},
                new City() { Name = "Manchester", Country = "England"},
                new City() { Name = "Manchester", Country = "England"},
                new City() { Name = "Manchester", Country = "England"},
                new City() { Name = "Manchester", Country = "England"},
                new City() { Name = "Manchester", Country = "England"},
                new City() { Name = "New York", Country = "USA"},
                new City() { Name = "New York", Country = "USA"},
                new City() { Name = "New York", Country = "USA"},
                new City() { Name = "New York", Country = "USA"},
                new City() { Name = "New York", Country = "USA"},
                new City() { Name = "New York", Country = "USA"},
                new City() { Name = "New York", Country = "USA"},
                new City() { Name = "Boston", Country = "USA"}

I added screenshots here which until header "Italy" works correctly, but later  "Spain" & "USA" header are not sticking as we scroll up.             
Last Updated: 15 Sep 2021 08:34 by ADMIN
Release R3 2021
Created by: Didi
Comments: 4
Category: UI for Xamarin
Type: Feature Request
Already available for MultiDayView
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