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)

public partial class MainPage : ContentPage
{
    private RadPopup internalPopup;

    public MainPage()
    {
        InitializeComponent();
    }

    protected override void OnAppearing()
    {
        base.OnAppearing();

        var popup = typeof(RadComboBox).GetField("popup", BindingFlags.NonPublic | BindingFlags.Instance)?.GetValue(ComboBox1);

        if (popup is RadPopup p1)
        {
            internalPopup = p1;
            internalPopup.PropertyChanged += InternalPopup_PropertyChanged;
        }
    }

    private void InternalPopup_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
    {
        if (e.PropertyName != nameof(RadPopup.IsOpen))
            return;
        
        if (internalPopup.IsOpen)
        {
            // Popup was opened
        }
        else
        {
            // Popup was closed
        }
    }

    protected override void OnDisappearing()
    {
        if (internalPopup != null)
            internalPopup.PropertyChanged -= InternalPopup_PropertyChanged;

        base.OnDisappearing();
    }
}

private void Button_Clicked(object sender, System.EventArgs e)
        {
            this.radEntry.Text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. ";
        }

<telerikImageEditor:RadImageEditorToolbar Grid.Row="1" 
                                                  ImageEditor="{x:Reference imageEditor}" 
                                                  AutoGenerateItems="False" 
                                                  IsMultiLine="True">
            <telerikImageEditor:EffectsToolbarItem AutoGenerateItems="False">
                <telerikImageEditor:ContrastToolbarItem AutoGenerateItems="False">
                    <telerikImageEditor:CancelToolbarItem HorizontalOptions="Start" />
                    <telerikImageEditor:TemplateToolbarItem>
                        <telerikImageEditor:TemplateToolbarItem.Template>
                            <DataTemplate>
                                <Slider Maximum="2" Minimum="0" Value="{Binding Value}" />
                            </DataTemplate>
                        </telerikImageEditor:TemplateToolbarItem.Template>
                    </telerikImageEditor:TemplateToolbarItem>
                    <telerikImageEditor:ApplyToolbarItem HorizontalOptions="End" />
                </telerikImageEditor:ContrastToolbarItem>
            </telerikImageEditor:EffectsToolbarItem>
 </telerikImageEditor:RadImageEditorToolbar>

<telerikChart:RadCartesianChart PaletteName="Light"
                                Zoom="2, 1">
    <telerikChart:RadCartesianChart.BindingContext>
        <local:ViewModel/>
    </telerikChart:RadCartesianChart.BindingContext>
    <telerikChart:RadCartesianChart.HorizontalAxis>
        <telerikChart:DateTimeContinuousAxis LabelFitMode="Rotate"
                                             MajorStepUnit="Day"
                                             PlotMode="OnTicks"
                                             LabelFormat="dd MMM"
                                             MajorStep="20"
                                             ShowLabels="True"/>
    </telerikChart:RadCartesianChart.HorizontalAxis>
    <telerikChart:RadCartesianChart.VerticalAxis>
        <telerikChart:NumericalAxis />
    </telerikChart:RadCartesianChart.VerticalAxis>
    <telerikChart:RadCartesianChart.Series>
        <telerikChart:LineSeries ValueBinding="Value"
                                 CategoryBinding="Date"
                                 DisplayName="Sales"
                                 ItemsSource="{Binding Data}"/>
    </telerikChart:RadCartesianChart.Series>
    <telerikChart:RadCartesianChart.ChartBehaviors>
        <telerikChart:ChartPanAndZoomBehavior ZoomMode="Horizontal" 
                                              PanMode="Horizontal" 
                                              HandleDoubleTap="True"/>
    </telerikChart:RadCartesianChart.ChartBehaviors>
</telerikChart:RadCartesianChart>