How to handle the Theme support in the SfRichTextEditor control

<ContentPage.Resources>

        <syncCore:SyncfusionThemeDictionary>

            <syncCore:SyncfusionThemeDictionary.MergedDictionaries>

                <syncCore:DarkTheme />

            </syncCore:SyncfusionThemeDictionary.MergedDictionaries>

        </syncCore:SyncfusionThemeDictionary>

    </ContentPage.Resources>

    <StackLayout x:Name="stack">

        <rte:SfRichTextEditor x:Name="richtexteditor" VerticalOptions="FillAndExpand" Text="The rich text editor component is WYSIWYG editor that provides the best user experience to create and update the content"/>

        <StackLayout HorizontalOptions="CenterAndExpand">

            <StackLayout Orientation="Horizontal">

                <Label x:Name="darkLabel" Text="Dark" />

                <Switch Toggled="Handle_Toggled" />

                <Label x:Name="lightLabel" Text="Light" />

            </StackLayout>

        </StackLayout>

    </StackLayout>

private void Handle_Toggled(object sender, ToggledEventArgs e)

        {

            var pageResources = Resources;

            var mergedDictionaries = (pageResources as SyncfusionThemeDictionary)?.MergedDictionaries;

            if (mergedDictionaries != null)

            {

                foreach (var item in mergedDictionaries.Reverse<ResourceDictionary>())

                {

                    var dictionary = item as ResourceDictionary;

                    if (dictionary.ContainsKey("SyncfusionTheme"))

                    {

                        var themeType = dictionary["SyncfusionTheme"] as string;

                        mergedDictionaries.Remove(item);

                        //Remove theing dark theme and apply the Light theme. applied

                        if (themeType == "DarkTheme")

                        {

                            mergedDictionaries.Add(new LightTheme());

                        }

                        //Remove theing light theme and apply the dark theme. applied

                        else

                        {

                            Resources["SfRichTextEditorFontColor"] = Color.FromHex("#FF5722");

                            mergedDictionaries.Add(new DarkTheme());

                        }

                    }

                }

            }

        }

 Button emojiButton = new Button();

 emojiButton.BackgroundColor = Color.Transparent;

 emojiButton.HeightRequest = 50;

 emojiButton.WidthRequest = 50;

 emojiButton.Text = "\U0001F642";

 collection.Add(emojiButton);

 emojiButton.Clicked += EmojiButton_Clicked;

 richTextEditor.ToolbarItems = collection;

 this.Content = richTextEditor;

 private void EmojiButton_Clicked(object sender, EventArgs e)

  {

     richTextEditor.InsertHTMLText("&#128522;");

  }