at Microsoft.Maui.Controls.BindableObject.ApplyBindings(Boolean fromBindingContextChanged)
   at Microsoft.Maui.Controls.BindableObject.SetInheritedBindingContext(BindableObject bindable, Object value)
   at Microsoft.Maui.Controls.Element.SetChildInheritedBindingContext(Element child, Object context)
   at Microsoft.Maui.Controls.TemplatedPage.SetChildInheritedBindingContext(Element child, Object context)
   at Microsoft.Maui.Controls.Element.SetLogicalChildBindingContext(BindableObject child, Object bc)
   at Microsoft.Maui.Controls.BindableObjectExtensions.PropagateBindingContext[T](BindableObject self, IEnumerable`1 children, Action`2 setChildBindingContext)
   at Microsoft.Maui.Controls.Element.OnBindingContextChanged()
   at Microsoft.Maui.Controls.VisualElement.OnBindingContextChanged()
   at Microsoft.Maui.Controls.Page.OnBindingContextChanged()
   at Microsoft.Maui.Controls.ContentPage.OnBindingContextChanged()
   at Microsoft.Maui.Controls.BindableObject.BindingContextPropertyChanged(BindableObject bindable, Object oldvalue, Object newvalue)
   at Microsoft.Maui.Controls.BindableObject.OnBindablePropertySet(BindableProperty property, Object original, Object value, Boolean didChange, Boolean willFirePropertyChanged)
   at Microsoft.Maui.Controls.Element.OnBindablePropertySet(BindableProperty property, Object original, Object value, Boolean changed, Boolean willFirePropertyChanged)
   at Microsoft.Maui.Controls.BindableObject.SetValueActual(BindableProperty property, BindablePropertyContext context, Object value, Boolean currentlyApplying, SetValueFlags attributes, SetterSpecificity specificity, Boolean silent)
   at Microsoft.Maui.Controls.BindableObject.SetValueCore(BindableProperty property, Object value, SetValueFlags attributes, SetValuePrivateFlags privateAttributes, SetterSpecificity specificity)
   at Microsoft.Maui.Controls.BindableObject.SetValue(BindableProperty property, Object value)
   at Microsoft.Maui.Controls.BindableObject.set_BindingContext(Object value)

Exception Message:
Object reference not set to an instance of an object

Exception Stack:
   at Telerik.Maui.Data.ParallelDataEngine.Telerik.Maui.Data.IDataEngine.RebuildAggregatesForItem(Object item, String propertyName)
   at Telerik.Maui.Data.LocalDataSourceProvider.ProcessPropertyChangedOverride(Object sender, PropertyChangedEventArgs args)
   at Telerik.Maui.Data.LocalDataSourceProvider.DataView_ItemPropertyChanged(Object sender, PropertyChangedEventArgs e)
   at Telerik.Maui.Data.EnumerableDataSourceView.Telerik.Maui.IWeakEventListener.ReceiveEvent(Object sender, Object args)
   at Fmr.Sirius.ComponentModel.ObservableObject.FirePropertyChanged(IEnumerable`1 propertyChanges)
   at System.Reactive.AnonymousSafeObserver`1.OnNext(T value)
   at System.Reactive.Concurrency.AsyncLock.Wait(Object state, Delegate delegate, Action`2 action)
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.TimerQueueTimer.System.Threading.IThreadPoolWorkItem.Execute()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()
   at System.Threading.Thread.StartCallback()

Exception.Stack 2:

   at Telerik.Maui.Data.ParallelDataEngine.Telerik.Maui.Data.IDataEngine.RebuildAggregatesForItem(Object item, String propertyName)
   at Telerik.Maui.Data.LocalDataSourceProvider.ProcessPropertyChangedOverride(Object sender, PropertyChangedEventArgs args)
   at Telerik.Maui.Data.LocalDataSourceProvider.DataView_ItemPropertyChanged(Object sender, PropertyChangedEventArgs e)
   at Telerik.Maui.Data.EnumerableDataSourceView.Telerik.Maui.IWeakEventListener.ReceiveEvent(Object sender, Object args)
   at Fmr.Sirius.ComponentModel.ObservableObject.FirePropertyChanged(IEnumerable`1 propertyChanges)
   at System.Reactive.AnonymousSafeObserver`1.OnNext(T value)
   at System.Reactive.Linq.ObservableImpl.Sample`1._.Tick()
   at System.Reactive.Concurrency.DefaultScheduler.PeriodicallyScheduledWorkItem`1.<>c.<Tick>b__5_0(PeriodicallyScheduledWorkItem`1 closureWorkItem)
   at System.Reactive.Concurrency.AsyncLock.Wait(Object state, Delegate delegate, Action`2 action)
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.TimerQueueTimer.System.Threading.IThreadPoolWorkItem.Execute()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()
   at System.Threading.Thread.StartCallback()

<Style TargetType="telerik:DataGridGroupingPanel">
    <Setter Property="BackgroundColor" Value="Red"/>
    <Setter Property="HeaderText" Value="Hello to group"/>
    <Setter Property="CornerRadius" Value="10"/>
    <Setter Property="BorderThickness" Value="2"/>
    <Setter Property="BorderColor" Value="Blue"/>
</Style>