Hi
<telerik:RadScheduleView x:Name="scheduleView"
GroupDescriptionsSource="{Binding GroupDescriptions}"
ResourceTypesSource="{Binding Resources}" VisibleRangeChanged="scheduleView_VisibleRangeChanged"
VisibleRangeChangedCommand="{Binding VisibleRangeChanged}"
VisibleRangeChangedCommandParameter="{Binding VisibleRange, RelativeSource={RelativeSource Self}}"
GroupHeaderContentTemplateSelector="{StaticResource CustomGroupHeaderContentTemplateSelector}">
<telerik:RadScheduleView.ViewDefinitions>
<telerik:DayViewDefinition />
<telerik:WeekViewDefinition />
</telerik:RadScheduleView.ViewDefinitions>
</telerik:RadScheduleView>
private void scheduleView_VisibleRangeChanged(object sender, EventArgs e)
{
this.scheduleView.AppointmentsSource = new ObservableCollection<Appointment>();
}