How to filter the events in the Xamarin.Forms Calendar by searching the subject?

 <?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:local="clr-namespace:FilteringEvents"
             xmlns:combobox="clr-namespace:Syncfusion.XForms.ComboBox;assembly=Syncfusion.SfComboBox.XForms"
             xmlns:syncfusion="clr-namespace:Syncfusion.SfCalendar.XForms;assembly=Syncfusion.SfCalendar.XForms"
             x:Class="FilteringEvents.MainPage">
    <ContentPage.Behaviors>
        <local:CalendarBehavior/>
    </ContentPage.Behaviors>
    <Grid x:Name="MainLayout" Padding="0,20,0,0">
        <Grid.RowDefinitions>
            <RowDefinition Height="0.1*"/>
            <RowDefinition Height="0.9*"/>
        </Grid.RowDefinitions>
        <combobox:SfComboBox Grid.Row="0" BorderColor="Blue" ShowDropDownHeaderView="true" 
                             IsEditableMode="true" HeightRequest="40" DisplayMemberPath="Subject" x:Name="comboBox">
        </combobox:SfComboBox>
        <syncfusion:SfCalendar Grid.Row="1" x:Name="calendar">
        </syncfusion:SfCalendar>
    </Grid>
</ContentPage>

namespace FilteringEvents
{
    public class CalendarBehavior: Behavior<ContentPage>
    {
        private SfCalendar calendar;
        private SfComboBox comboBox;
        private CalendarEventCollection calendarInlineEvents = new CalendarEventCollection();
        public CalendarBehavior()
        {
        }
 
        protected override void OnAttachedTo(ContentPage bindable)
        {
            var page = bindable as Page;
            calendar = page.FindByName<SfCalendar>("calendar");
            comboBox = page.FindByName<SfComboBox>("comboBox");
 
            // To display inline appointment layout.
            calendar.ShowInlineEvents = true;
            calendar.InlineViewMode = InlineViewMode.Agenda;
            var currentDay = DateTime.Now.Date;
 
            for (int i = 0; i < 10; i++)
            {
                calendarInlineEvents.Add(new CalendarInlineEvent()
                {
                    StartTime = currentDay.AddDays(i),
                    EndTime = currentDay.AddDays(i),
                    Subject = "Meeting on " + currentDay.AddDays(i).ToString("dd/MM/yy"),
                    Color = Color.Fuchsia
                });
 
                calendarInlineEvents.Add(new CalendarInlineEvent()
                {
                    StartTime = currentDay.AddDays(i),
                    EndTime = currentDay.AddDays(i),
                    Subject = "Conference on " + currentDay.AddDays(i).ToString("dd/MM/yy"),
                    Color = Color.Fuchsia
                });
            }
            // Setting data source for 3 months.
            calendar.DataSource = calendarInlineEvents;
 
            // Setting data dource for combo box
            comboBox.DataSource = calendarInlineEvents;
            // Displaying data in combo box based on subject
            comboBox.DisplayMemberPath = "Subject";
            comboBox.SelectionChanged += ComboBox_SelectionChanged;
            base.OnAttachedTo(bindable);
        }
 
        protected override void OnDetachingFrom(ContentPage bindable)
        {
            comboBox.SelectionChanged -= ComboBox_SelectionChanged;
            base.OnDetachingFrom(bindable);
        }
 
        /// <summary>
        /// Gets the appointments based on subject.
        /// </summary>
        /// <returns>The appointments.</returns>
        /// <param name="subject">Subject.</param>
        private CalendarEventCollection GetAppointments(string subject)
        {
            var data = new CalendarEventCollection();
            foreach (var item in calendarInlineEvents)
            {
                if (item.Subject == subject)
                    data.Add(item);
            }
            return data;
        }
 
        /// <summary>
        /// Combo box selection is changed.
        /// </summary>
        /// <param name="sender">Sender.</param>
        /// <param name="e">E.</param>
        private void ComboBox_SelectionChanged(object sender, Syncfusion.XForms.ComboBox.SelectionChangedEventArgs e)
        {
            // Returning when value is cleared in combo box.
            if ((e.Value as CalendarInlineEvent) == null || String.IsNullOrEmpty((e.Value as CalendarInlineEvent).Subject))
                return;
 
            // Setting calendar data source based on subject filtered data.
            calendar.DataSource = GetAppointments((e.Value as CalendarInlineEvent).Subject);
            calendar.MoveToDate = GetAppointments((e.Value as CalendarInlineEvent).Subject)[0].StartTime;
        }
    }
}