Please refer to the attached gif files. The separator ";" should be displayed when the appointment's information is displayed in a single line. Otherwise, the information should be displayed multi-line like in the OutlookSeparator.gif.

Note: you can test with different AppointmentTitleFormat.

Important: setting the Text in the AppointmentFormatting event must have higher priority than AppointmentTitleFormat!!!

Workaround:

Sub New() 
    InitializeComponent()

    Me.RadScheduler1.ElementProvider = New MyElementProvider(Me.RadScheduler1)
    Me.RadScheduler1.Appointments.Add(New Appointment(DateTime.Now, TimeSpan.FromMinutes(40), "Summary", "Description", "Location"))
End Sub

Public Class CustomAppointmentElement
Inherits AppointmentElement
    Public Sub New(scheduler As RadScheduler, view As SchedulerView, appointment As IEvent)
        MyBase.New(scheduler, view, appointment)

    End Sub

    Protected Overrides Function CreateAppointmentText() As String
        Return String.Format("{0:HH:mm} - {1:HH:mm} {3} <b>{2}</b>", Me.Appointment.Start, Me.Appointment.End, _
                             Me.Appointment.Location, Me.Appointment.Summary)
    End Function
End Class

Public Class MyElementProvider
Inherits SchedulerElementProvider
    Public Sub New(scheduler As RadScheduler)
        MyBase.New(scheduler)
    End Sub
    Protected Overrides Function CreateElement(Of T As SchedulerVisualElement)(view As SchedulerView, context As Object) As T
        If GetType(T) = GetType(AppointmentElement) Then
            Return TryCast(New CustomAppointmentElement(Me.Scheduler, view, DirectCast(context, IEvent)), T)
        End If
       
        Return MyBase.CreateElement(Of T)(view, context)
    End Function
End Class