Completed
Last Updated: 11 Jul 2025 08:40 by ADMIN
Release 11.0.1
When UseWindowSoftInputModeAdjust to Resize and keyboard closes, the CollectionView does not scroll.
Completed
Last Updated: 09 Jul 2025 12:43 by ADMIN
Release 11.0.1
When the client picks a random item from the ItemSource and changes the value of its property for which a GroupDescriptor is set, the CollectionView crashes.
Completed
Last Updated: 09 Jul 2025 12:43 by ADMIN
Release 11.0.1
When the CollectionView is grouped and an element is removed from the source collection and inserted again immediately after that, it results in its parent group not expanding/collapsing when tapped. The tap is registered and the visual indicator of the group state is changed but the group is not actually collapsing and expanding. This issue is happening for groups with only one child item. When scrolling so the group gets our of the visible area and then scroll to the group again, the collapse/expand functionality works.
Completed
Last Updated: 09 Jul 2025 12:43 by ADMIN
Release 11.0.1

I see iOS crashes in Sentry, seems like caused by clearing the RadCollectionView bound DataSource ObservableCollection, when an item was previously selected

Maui 9.0.70
Telerik 11.0

System.NullReferenceException: Arg_NullReferenceException
  ?, in void RadCollectionViewItemView.OnIsSelectedChanged()
  ?, in static RadCollectionViewItemView()+(BindableObject b, object o, object n) => { }
  ?, in void BindableObject.OnBindablePropertySet(BindableProperty property, object original, object value, bool didChange, bool willFirePropertyChanged)
  ?, in void Element.OnBindablePropertySet(BindableProperty property, object original, object value, bool changed, bool willFirePropertyChanged)
  ?, in void BindableObject.SetValueActual(BindableProperty property, BindablePropertyContext context, object value, bool currentlyApplying, SetValueFlags attributes, SetterSpecificity specificity, bool silent)
  ?, in void BindableObject.SetValueCore(BindableProperty property, object value, SetValueFlags attributes, SetValuePrivateFlags privateAttributes, SetterSpecificity specificity)
  ?, in void BindableObject.SetValue(BindableProperty property, object value)
  ?, in void RadCollectionViewItemView.set_IsSelected(bool value)
  ?, in void RadCollectionView.SelectContainers(IEnumerable items, bool select)
  ?, in void RadCollectionView.SelectionHelperSelectionChanged(object sender, RadSelectionChangedEventArgs e)
  ?, in void <>c__DisplayClass36_0.<SelectionChangerSelectionChanged>b__0(?)+() => { }
  ?, in void ActiveSelectionScope.Dispose()
  ?, in void SelectionHelper.ClearSelection()
  ?, in void RadCollectionView.Telerik.Maui.Controls.ICollectionView.ItemsChanged(NotifyCollectionChangedEventArgs e)
  ?, in void CollectionViewModel.OnDataProviderViewChanged(object sender, ViewChangedEventArgs e)
  ?, in void DataProviderBase.RaiseViewChanged(object sender, List<AddRemoveResult> changes, NotifyCollectionChangedEventArgs args, CollectionChange action, bool affectsAggregates)
  ?, in void LocalDataSourceProvider.ProcessCollectionChanged(NotifyCollectionChangedEventArgs e)
  ?, in void LocalDataSourceProvider.DataView_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
  ?, in void EnumerableDataSourceView.RaiseCollectionChanged(object sender, NotifyCollectionChangedEventArgs args)
  ?, in void EnumerableDataSourceView.ProcessCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
  ?, in void EnumerableDataSourceView.ProcessCollectionChangedOverride(object sender, NotifyCollectionChangedEventArgs args)
  ?, in void EnumerableDataSourceView.ProcessPendingCollectionChange()
  ?, in void DataProviderBase.RaiseViewChanging(object sender, IList changedItems, CollectionChange action)
  ?, in void LocalDataSourceProvider.DataView_CollectionChanging(object sender, NotifyCollectionChangedEventArgs e)
  ?, in void EnumerableDataSourceView.HandleCollectionChangedOverride(object sender, NotifyCollectionChangedEventArgs e)
  ?, in void EnumerableDataSourceView.Telerik.Maui.IWeakEventListener.ReceiveEvent(object sender, object args)
  ?, in void WeakEventHandlerList<NotifyCollectionChangedEventArgs>.ProcessEvent(object sender, object args)
  ?, in void WeakEventHandlerList<NotifyCollectionChangedEventArgs>.OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
  ?, in void ObservableCollection<ViewBundle>.OnCollectionChanged(NotifyCollectionChangedEventArgs)
  ?, in void ExtObservableCollection<ViewBundle>.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
  ?, in void ObservableCollection<ViewBundle>.OnCollectionReset()
  ?, in void ObservableCollection<ViewBundle>.ClearItems()
  ?, in void ExtObservableCollection<ViewBundle>.ClearItems()
  ?, in void Collection<ViewBundle>.Clear()
  ?, in void SearchViewViewModel.Dispose(bool disposing)
  ?, in void PropertyChangedNotifyingBase.Dispose()
  ?, in async void ViewBundle.Dispose(bool disposing)
  ?, in void <>c.<ThrowAsync>b__128_0(?)+(object state) => { }
  ?, in void NSAsyncSynchronizationContextDispatcher.Apply()
  ?, in void __Registrar_Callbacks__.callback_3311_Foundation_NSAsyncSynchronizationContextDispatcher_Apply(IntPtr pobj, IntPtr sel, IntPtr* exception_gchandle)

Completed
Last Updated: 09 Jul 2025 12:43 by ADMIN
Release 11.0.1

When having a CollectionView and navigating between different views when tapping on an item from the CollectionView, the item(s) look(s) selected. 

It seems the behavior is due to the mouse over and selected visual states.

Completed
Last Updated: 21 May 2025 08:09 by ADMIN
Release 11.0.0 (2025 Q2)
Null Ref Exception occurs when calling ScrollItemIntoView at the time when navigating away from the page. 
Completed
Last Updated: 21 May 2025 08:08 by ADMIN
Release 11.0.0 (2025 Q2)
Setting the ItemViewStyle to have a Margin of any value greater than zero makes the items height to increase continuously when scrolling. 
Declined
Last Updated: 12 May 2025 06:29 by ADMIN
Created by: Malcolm
Comments: 20
Category: CollectionView
Type: Bug Report
3
Our error reporting is getting multiple of these crashes:
Message: Object reference not set to an instance of an object
Telerik.Maui.Data.LocalDataSourceProvider.ProcessCollectionChanged(NotifyCollectionChangedEventArgs e)
Telerik.Maui.Data.LocalDataSourceProvider.ProcessPendingChanges()
Telerik.Maui.Data.LocalDataSourceProvider.OnCompleted(Object sender, DataEngineCompletedEventArgs e)
Telerik.Maui.Data.ParallelDataEngine.RaiseCompleted(DataEngineCompletedEventArgs args)
Telerik.Maui.Data.ParallelDataEngine.ProcessBottomLevelsParallel(Task`1 bottomLevelResultsTask, ParallelState parallelState)
Telerik.Maui.Data.ParallelDataEngine+<>c__DisplayClass102_0.<BeginParallelProcessing>b__1(Task`1 task)
System.Threading.Tasks.ContinuationTaskFromResultTask`1[[Telerik.Maui.Data.ParallelDataEngine+GroupingResults, Telerik.Maui.Core, Version=10.0.0.0, Culture=neutral, PublicKeyToken=5803cfa389c90ce7]].InnerInvoke()
System.Threading.Tasks.Task+<>c.<.cctor>b__292_0(Object obj)
System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread , ExecutionContext , ContextCallback , Object )
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread , ExecutionContext , ContextCallback , Object )
System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& , Thread )

unfortunately we don't have a repro for this crash just yet.

It does look like it's occuring on iOS only.
Completed
Last Updated: 04 Apr 2025 09:50 by ADMIN
Release 10.1.0
Steps to Reproduce

1. Create a RadCollectionView with an ObservableCollection<ButtonModel> as the ItemsSource.

2. Use a DataTemplate inside RadCollectionView.ItemTemplate to display buttons.

3. Bind button properties (IsOddClick, IsEvenClick) that should change on click.

4. Click the button inside the RadCollectionView and observe that:

5. The text updates correctly, but part of it is cut off. It seems the text does not expand 
Completed
Last Updated: 04 Apr 2025 09:50 by ADMIN
Release 10.1.0

1. Bind the CheckedItems collection of the TreeView to the CollectionView ItemsSource.

2. there aren't any items in the TreeView initially.  Add items to it

3. Start checking the checkboxes

4. The items are added to the CollectionView, still they are not visible in the control.

 

Completed
Last Updated: 04 Apr 2025 09:50 by ADMIN
Release 10.1.0
When removing items from the collection's item source, the group header item count does not update real time. It only updates when the GroupContext is collapsed or expanded. This would also be an issue if items are added dynamically.
Completed
Last Updated: 04 Apr 2025 09:50 by ADMIN
Release 10.1.0

The content inside the swipe template is missing when using MAUI 9.0.40 and Telerik MAUI 10.0.0

Workaround:

Use MAUI 9.0.30 and Telerik MAUI 10.0.0

Completed
Last Updated: 04 Apr 2025 09:50 by ADMIN
Release 10.1.0
There is a memory leak in the CollectionView on iOS/MacCatalyst - when the CollectionView control is on the page, the page does not dispose when GC runs. Same behavior happens with the RadListview.
Completed
Last Updated: 17 Mar 2025 13:31 by ADMIN
Release 10.0.0 (2025 Q1)
Created by: Zelin
Comments: 17
Category: CollectionView
Type: Bug Report
7
I observe scrolling issues in the CollectionView on iOS when using Maui 9.0.30 version. 
For example the control has 25 items, I can scroll only to the first 10-11, cannot see the rest of the items.
Unplanned
Last Updated: 26 Feb 2025 16:35 by Elke
CollectionView item swipe doesn't work.
Unplanned
Last Updated: 19 Feb 2025 12:34 by Ryan

Having a RadExpander inside the ItemTemplate breaks the Drag and Drop gesture of the RadCollectionView. 

When Using MAUI CollectionView and RadExpander in the template, drag and drop works.

Unplanned
Last Updated: 28 Jan 2025 09:01 by ADMIN
When scrolling to the last item using the ScrollITemIntoVIew() method to show the last item of a CollectionView, It doesn't scroll to the end of the list and only show the first pixels of the last item.
Unplanned
Last Updated: 24 Jan 2025 19:24 by ADMIN
When having swipe and tap gestures and building on Samsung device with android 13 the swipe gesture is with higher priority. the sensitivity of swipe is very high, resulting in not recognizing the tap.
Unplanned
Last Updated: 21 Jan 2025 05:51 by ADMIN

The ItemsSource of the views is populated in the ViewModel of the page. This is done in a command that is triggered by the NavigatedTo event of the page, which is forwarded via EventToCommandBehavior from the Maui Toolkit.

When using the RadCollectionView the loaded items are no longer displayed. 

When the ObservableCollection of the items is completely reconstructed and reassigned the display works.

Unplanned
Last Updated: 16 Dec 2024 13:13 by ADMIN

See simple example baaaaif/CollectionViewFilterIssue (MainPage.xaml.cs) to reproduce, click hide and show

When items are filtered through a FilterDescriptor they are hidden - correct
Trying to show the previously hidden items they don't appear again as expected - bug

I've used a BooleanFilterDescriptor and a DelegateFilterDescriptor, both don't work.

Stops me from using the RadCollectionView control

 

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