Last Updated: 31 Aug 2021 13:12 by Tom

When using a RadListview with a Grid or a Stack Layout in iOS I get the following exception. I haven't tested using the stacklayout outside of the RadListView nor have I tested it outside of the ItemTemplateSelector

Telerik.XamarinForms.Common.NotRegisteredRendererException: There is no renderer registered for the specified type: Xamarin.Forms.Grid
It works fine on Android. Below is the xaml I'm using.

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns=""
            <DataTemplate x:Key="NonDivisibleTemplate">
                    <StackLayout Orientation="Vertical" Padding="10" Spacing="0" BackgroundColor="Yellow" InputTransparent="True" Unfocused="StackLayout_Unfocused">
                        <Label Text="{Binding ItemText}"/>
            <DataTemplate x:Key="DivisibleTemplate">
                    <StackLayout Orientation="Vertical" Padding="15" Spacing="0" BackgroundColor="White" Unfocused="StackLayout_Unfocused">
                        <Label Text="{Binding ItemText}" FontSize="Large" HorizontalTextAlignment="Center"/>
                        <Label Text="{Binding ItemText}" FontSize="Small" FontAttributes="Italic" TextColor="Gray"/>

                NonDivisibleTemplate="{StaticResource NonDivisibleTemplate}"
                DivisibleTemplate="{StaticResource DivisibleTemplate}" />

    <StackLayout VerticalOptions="StartAndExpand">
        <!-- Place new controls here -->
        <views:FloatingLabelEntry EntryText="{Binding EntryText}" Margin="20" BackgroundColor="Yellow" PlaceholderText="{Binding PlaceholderText}"/>
        <Entry TextChanged="Entry_TextChanged" BackgroundColor="AliceBlue" Margin="20"/>
        <telerikDataControls:RadListView x:Name="listView" ItemsSource="{Binding ListItems}" ItemTemplateSelector="{StaticResource MyTemplateSelector}" SelectionMode="Single" IsItemSwipeEnabled="False" >
            <!--<Grid Margin="0"
                            <ColumnDefinition Width="*" />
                            <ColumnDefinition Width="*" />
                    <StackLayout Orientation="Horizontal" HorizontalOptions="FillAndExpand">
                        <Label BackgroundColor="#2474d2"
                       Text="Mark as read"
                       VerticalTextAlignment="Center" />
                        <Label Grid.Column="2"

Last Updated: 22 Jun 2021 09:27 by ADMIN
When dismissing the swipe by swiping to close, the ItemTap event is fired on Android.  
Last Updated: 13 Apr 2021 11:57 by ADMIN
Release 2021.1.413 (R1 2021 minor release)
If ListView has PressedItemStyle defined and the end user holds onto any control, such as Label, for example, placed outside ListView, the PressedItemStyle is applied to all items. Can only be reproduced on Android.
Last Updated: 13 Apr 2021 11:56 by ADMIN
Release 2021.1.413 (R1 2021 minor release)
When you have Automatic LoadOnDemandMode enabled and use LoadOnDemand event to load the items,  the event is fired multiple times unnecessarily.
Last Updated: 17 Mar 2021 08:57 by ADMIN

Telerik RadListView with two Columns - they are Thumbnails with a tap gesture. When we change the Spancount to 1 there is no right border line but when set back to 2 it shows as the screenshot on IOS, 

The issue happens on iPhone 11, XR, devices with a notch, and when ListViewGridLayout is with SpanCount="2".

Workaround: Set the background color of the ListViewItemStyle to Transparent

    <telerikListView:ListViewItemStyle BorderWidth="0" 


Last Updated: 02 Mar 2021 06:54 by ADMIN
Created by: Jason
Comments: 1
Category: ListView
Type: Bug Report

Hello, could you provide some guidance about the following situation....


I have a scenario using the RadListView that implements a PropertyGroupDescriptor for a property attached to my ObservableCollection<T>, where the property that it is monitoring is string value.  The dataset is designed that it may have only one grouping before an item is selected them the dataset will have two different groupings.  One the data changes, the ListView updates to show that there are two different groups but the group header doesn't change and neither does the cell content.  If I click on the GroupHeader of the new section, then it updates to reflect the change in data.  Is there a way to get the data to change in the Listview with some kind of Refresh so it stays up to date with the data.

Seeing it on iOS right now.



Last Updated: 01 Mar 2021 07:55 by ADMIN
We have RadListView and its ItemTemplate there is a RadPopup control (shown as a context menu). If we open and close the popup, then ListView Pull To Refresh event is not triggering.  This issue is only happening on iOS devices whereas same code is working on Android devices. 
Last Updated: 24 Feb 2021 15:05 by ADMIN
Release R1 2021 SP1

After I updated to `2021.1216.1-hotfix` (to solve this problem in Android and Google Material) the RadListView's LoadOnDemand automatic  stopped working 



I've had to downgrade Xamarin.Google.Android.Material to v1.1.0.5 and use the latest stable release of Telerik UI v2021.1.119.1 which restored the functionality.

Last Updated: 18 Feb 2021 15:57 by ADMIN
After a reorder operation has been started, and the user drops down the item, every item between original position and new position is animated again as if refreshing the entire Ui of those items.
Last Updated: 07 Dec 2020 16:10 by ADMIN
Release 2020.3.1207 (R3 2020 minor release)

Changing a property on an item that is involved with grouping and sorting and then removing and re-adding the item to the collection results in the list being in an invalid state (e.g. duplicate items, incorrect template, etc.)

Error message can be reproduced on iPhone 11 Simulator iOS 13.6 

[UICollectionView] Invalid update: invalid number of items in section 0.  The number of items contained in an existing section after the update (4) must be equal to the number of items contained in that section before the update (4), plus or minus the number of items inserted or deleted from that section (1 inserted, 0 deleted) and plus or minus the number of items moved into or out of that section (0 moved in, 0 moved out). - will perform reloadData. UICollectionView instance: <TKCollectionView: 0x7f8525b86600; baseClass = UICollectionView; frame = (0 0; 414 725); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0x600001232bb0>; layer = <CALayer: 0x6000019b0520>; contentOffset: {0, 0}; contentSize: {414, 453}; adjustedContentInset: {0, 0, 0, 0}; layout: <TKListViewLinearLayout: 0x7f8524f5e400>; dataSource: <Telerik_XamarinForms_DataControlsRenderer_iOS_TKExtendedListView: 0x7f8524f5b590; frame = (0 0; 414 725); layer =
 <CALayer: 0x6000019b03a0>>>; currentUpdate: [UICollectionViewUpdate - 0x7f8526897fc0: old:<UICollectionViewData: 0x6000025f4000> new<UICollectionViewData: 0x6000025f47e0> items:<(


Last Updated: 09 Nov 2020 10:48 by ADMIN
When ListView is grouped with sticky group headers enabled, and items have dynamic size in order to adjust their content, the ListView is not rendered correctly when scrolled.
Last Updated: 22 Oct 2020 15:32 by ADMIN
Release R3 2020 SP1
Cannot access a disposed object exception on Samsung Galaxy 8 and Galaxy 10
Last Updated: 05 Oct 2020 12:07 by ADMIN

When an item in the ItemsSource of a ListView is null, a NullReferenceException will be raised on Android when the items source is loaded to the list view.  Even if a DataTemplateSelector is applied to display a different datatemplate for null items, the app would still crash.

I attached a sample program that demonstrates the issue.  On iOS the app runs fine, but on Android the app crash at launch with a NullReferenceException.


Last Updated: 30 Sep 2020 13:31 by ADMIN

Activating the ItemHold event of an item in a list view requires holding down an item for a while.  On a physical/virtual Android device and a virtual iOS device, this can be done by holding down the mouse/finger lightly on an item for a short period of time.  However, on a physical iOS device (I am using a physical iPhone 6s to test this), holding down the item lightly with my finger won't activate the ItemHold event, and I have to hold the item really hard on the screen in order to activate it (similar to using 3D Touch / Force Touch, and I cannot reliably activate the ItemHold event possibly because my force is sometimes not hard enough).  I noticed this behaviour on the physical iOS device since the ItemHold event got implemented in early 2018.

I created a simple application to demonstrate the issue.  The app displays an alert when the user taps/holds an item in the list view.  On a physical iOS device, holding down an item in the list view requires the user to press the item very hard on the screen.


Last Updated: 04 Sep 2020 07:41 by ADMIN
When you place a Label with TextType set to "Html" inside ListView TemplatedCell, the ListVIew renders only the items currently in the viewport - if you scroll down, the listview is empty. 
Last Updated: 20 Aug 2020 07:16 by ADMIN



I receive often a NullReferenceException in ListViewGroupHeader ArrangeOverride method.

The error happens only in UWP.

Unfortunately, I cannot create a project to reproduce the error.


Best regards,


Last Updated: 10 Jul 2020 08:31 by ADMIN
If you try to set/bind Zoom property of the Chart, the specified Zoom level is not taken into account
Last Updated: 03 Jun 2020 11:43 by ADMIN
If RadListView has Automatic LoadOnDemand enabled, and at some point when a LoadOnDemand operation is initiated ( user scrolls up to load more items), but the result is empty collection, the loading indicator is not hidden and further loading on demand is not possible.
Last Updated: 03 Jun 2020 05:55 by ADMIN
In cases ItemTemplate is defined in a way that items can have different height and LoadOnDemand is enabled, the newly loaded items sometimes are not rendered correctly ( their height is messed up).
Last Updated: 26 May 2020 15:00 by ADMIN

when a new ObservableCollection is assigned to the listview's ItemsSource during load on demand, there is an inconsistency in the scrolling.
- On Android the listview is scrolled to the top immediately and showing items at the top of the listview.

-On iOS and UWP, the listview position is not changed.

1 2 3 4 5 6