I want to perform some operation when the RadComboBox, RadTimePicker and RadDatePicker is focused or tapped. But even if I attach these events, they are not triggered.

Is there a way to do so. Kindly help.

Since adding the Telerik date picker control - we are getting an intermittent error:

System.ObjectDisposedException: Cannot access a disposed object. Object name: 'Android.Widget.PopupWindow'.

Call Stack below:

JniPeerMembers.AssertSelf (Java.Interop.IJavaPeerable self)
JniPeerMembers+JniInstanceMethods.InvokeVirtualVoidMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters)
PopupWindow.set_ContentView (Android.Views.View value)
RadPopup.ClearAndroidContext ()
RadPopup.UpdatePopupContext ()
RadPopup.OnPlacementTargetRendererChanged ()
PopupBase.PlacementTarget_PropertyChanged (System.Object sender, System.ComponentModel.PropertyChangedEventArgs e)
PopupBase+<>c.<AttachWeakEventListenerForPlacementTargetPropertyChanged>b__99_0 (Telerik.XamarinForms.Primitives.PopupBase listener, System.Object sender, System.ComponentModel.PropertyChangedEventArgs eventArgs)
WeakEventListener`3[TListener,TEventSource,TEventArgs].OnEvent (System.Object sender, TEventArgs eventArgs)
(wrapper delegate-invoke) <Module>.invoke_void_object_PropertyChangedEventArgs(object,System.ComponentModel.PropertyChangedEventArgs)
BindableObject.OnPropertyChanged (System.String propertyName)
Element.OnPropertyChanged (System.String propertyName)
BindableObject.ClearValue (Xamarin.Forms.BindableProperty property, System.Boolean fromStyle, System.Boolean checkAccess)
BindableObject.ClearValue (Xamarin.Forms.BindableProperty property)
Platform+<>c__DisplayClass45_0.<Cleanup>g__DoCleanup|0 ()
Platform.Cleanup (System.Collections.Generic.List`1[T] viewsToRemove, System.Collections.Generic.List`1[T] renderersToDispose)
Platform.SetPage (Xamarin.Forms.Page newRoot)
Platform.Dispose ()
FormsAppCompatActivity.OnDestroy ()
Activity.n_OnDestroy (System.IntPtr jnienv, System.IntPtr native__this)
(wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.8(intptr,intptr)

This is within the dispose method of what I assume is the telerik control. 

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:telerikInput="clr-namespace:Telerik.XamarinForms.Input;assembly=Telerik.XamarinForms.Input"
             x:Class="MobileInterface.Views.QuestionText"
             Shell.PresentationMode="ModalNotAnimated">
    <ContentPage.Content>
        <StackLayout>
            <StackLayout Grid.Row="1" Grid.Column="2" Orientation="Horizontal"
                         VerticalOptions="Start" HorizontalOptions="FillAndExpand"
                         BackgroundColor="{StaticResource Primary}" Padding="10"
                         >
                <Label Text="{Binding LocationTitle}"
                       FontSize="Small"
                       HorizontalTextAlignment="Start" Grid.Column="1"
                       HorizontalOptions="FillAndExpand"
                       TextColor="White"/>
                <Label Text="{Binding Title}"
                       FontSize="Small"
                       HorizontalTextAlignment="End" Grid.Column="2"
                       HorizontalOptions="FillAndExpand"
                       TextColor="White"
                   />
            </StackLayout>
            <Label Text="{Binding QuestionText}"
                   VerticalOptions="Center" 
                   HorizontalOptions="CenterAndExpand"
                   FontSize="Medium"                   
                   Margin="10"/>
            <Entry x:Name="dataEntry"  Text="{Binding Answer, Mode=TwoWay}" 
                   FontSize="{Binding FontSize}" 
                   VerticalOptions="CenterAndExpand" HorizontalOptions="FillAndExpand" 
                   IsVisible="{Binding IsTextType}}"
                   Keyboard="{Binding KeyboardType}"
                   Completed="dataEntry_Completed"
                   Focused="dataEntry_Focused"
                   Margin="10"/>
            <telerikInput:RadDateTimePicker
                x:Name="datePicker"
                Date="{Binding DateAnswer}"
                DefaultHighlightedDate="{Binding DateDefaultHightlight}"
                VerticalOptions="CenterAndExpand" HorizontalOptions="FillAndExpand"
                DisplayStringFormat="d"
                SpinnerFormat="d"
                SelectionChanged="RadDateTimePicker_SelectionChanged"
                IsVisible="{Binding IsDateType}">
                <telerikInput:RadDateTimePicker.SelectorSettings>
                    <telerikInput:PickerPopupSelectorSettings>
                        <telerikInput:PickerPopupSelectorSettings.AcceptButtonStyle>
                            <Style TargetType="Button">
                                <Setter Property="TextColor" Value="White"/>
                            </Style>
                        </telerikInput:PickerPopupSelectorSettings.AcceptButtonStyle>
                        <telerikInput:PickerPopupSelectorSettings.CancelButtonStyle>
                            <Style TargetType="Button">
                                <Setter Property="TextColor" Value="White"/>
                            </Style>
                        </telerikInput:PickerPopupSelectorSettings.CancelButtonStyle>
                    </telerikInput:PickerPopupSelectorSettings>
                </telerikInput:RadDateTimePicker.SelectorSettings>
            </telerikInput:RadDateTimePicker>            
            <Button Margin="0,10,0,0" Text="{Binding ButtonText}"
                        Clicked="Button_Clicked"                        
                        BackgroundColor="{StaticResource Primary}"
                        TextColor="White" />
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

I'm not sure if the IsVisible is what's jamming me up - it's a generic page that either is text based but if the type is a date - I swap out which one is visible.

Any input or thoughts are appreciated on this type of error.  It appears that it's been a common one in the Xamarin history.

Xamarin Forms:  5.0.0.2125

Telerik.UI.for.Xamarin.Input 2021.3.915.1

(same for the DataControls)

Hi, I'm trying to apply theme changes to telerikInput:RadDateTimePicker, place holder & text colour change from ThemeDark.xaml & ThemeLight.xaml

by using

DisplayLabelStyle="{AppThemeBinding Dark={StaticResource TextColorDark},
                                                            Light={StaticResource PrimaryTextColorLight}}"   

and

PlaceholderLabelStyle="{AppThemeBinding Dark={StaticResource TextColorDark},
                                                            Light={StaticResource PrimaryTextColorLight}}"            
                                    SelectionHighlightStyle="{StaticResource selectionHighlightStyle}"

but this AppThemeBinding doesn't work, If there is any working solution, please share with me.

Thanks

I have a RadDatePicker: <telerikInput:RadDatePicker x:Name="MainDatePicker"></telerikInput:RadDatePicker>

I have another button on the page that i want to use to pop the date selection. I would assume like other controls, i could just do: MainDatePicker.Focus(). This returns false, and doesn't actually pop the calendar selection.

If I use a standard DatePicker, it pops the calendar selection. Any ideas?