How can I add my own button as I marked in the picture?
<telerik:RadScheduleView.ViewDefinitions><telerik:DayViewDefinition DayStartTime="8:00" DayEndTime="20:00"/>
<telerik:WeekViewDefinition DayStartTime="8:00" DayEndTime="20:00" x:Name="WeekViewDefinition"/>
<telerik:MonthViewDefinition />
</telerik:RadScheduleView.ViewDefinitions>