public DataTemplate TimeScaleTemplate { get; set; }

Public Property TimeScaleTemplate As DataTemplate

Imports System.Windows
Imports System.Windows.Controls
Imports System

Namespace WpfSchedulerTimelineScalesTemplate
    Public Class TimeScaleTemplateSelector
        Inherits DataTemplateSelector

        Public Property WorkDayScaleTemplate() As DataTemplate
        Public Property WorkHourScaleTemplate() As DataTemplate
        Public Property FixedTimeScaleTemplate() As DataTemplate
        Public Overrides Function SelectTemplate(ByVal item As Object, ByVal container As DependencyObject) As DataTemplate
            Dim timeScale As TimeScaleViewModel = TryCast(item, TimeScaleViewModel)
            Select Case timeScale.Type
                Case ScaleType.WorkDay
                    Return WorkDayScaleTemplate
                Case ScaleType.WorkHour
                    Return WorkHourScaleTemplate
                Case ScaleType.FixedTime
                    Return FixedTimeScaleTemplate
                Case Else
                    Throw New NotImplementedException()
            End Select
        End Function
    End Class
End Namespace

Imports DevExpress.Mvvm.POCO
Imports System
Imports System.Collections.Generic
Imports System.Collections.ObjectModel

Namespace WpfSchedulerTimelineScalesTemplate
    Public Class MainViewModel
        Public Overridable Property Start() As Date
        Private privateCalendars As IEnumerable(Of TeamCalendar)
        Public Overridable Property Calendars() As IEnumerable(Of TeamCalendar)
            Get
                Return privateCalendars
            End Get
            Protected Set(ByVal value As IEnumerable(Of TeamCalendar))
                privateCalendars = value
            End Set
        End Property
        Private privateAppointments As IEnumerable(Of TeamAppointment)
        Public Overridable Property Appointments() As IEnumerable(Of TeamAppointment)
            Get
                Return privateAppointments
            End Get
            Protected Set(ByVal value As IEnumerable(Of TeamAppointment))
                privateAppointments = value
            End Set
        End Property
        Private privateTimeScales As ObservableCollection(Of TimeScaleViewModel)
        Public Overridable Property TimeScales() As ObservableCollection(Of TimeScaleViewModel)
            Get
                Return privateTimeScales
            End Get
            Protected Set(ByVal value As ObservableCollection(Of TimeScaleViewModel))
                privateTimeScales = value
            End Set
        End Property

        Protected Sub New()
            Start = TeamData.Start
            Calendars = New ObservableCollection(Of TeamCalendar)(TeamData.Calendars)
            Appointments = New ObservableCollection(Of TeamAppointment)(TeamData.AllAppointments)
            CreateTimeScales()
        End Sub

        Private Sub CreateTimeScales()
            TimeScales = New ObservableCollection(Of TimeScaleViewModel)()
            AddTimeScale("Work Day", True, ScaleType.WorkDay)
            AddTimeScale("Work Hour", True, ScaleType.WorkHour)
            AddFixedTimeScale("Half Hour", False, New TimeSpan(0, 30, 0))
        End Sub

        Private Sub AddTimeScale(ByVal caption As String, ByVal showHeaders As Boolean, ByVal type As ScaleType)
            Dim timeScale As TimeScaleViewModel = TimeScaleViewModel.Create()
            timeScale.Caption = caption
            timeScale.ShowHeaders = showHeaders
            timeScale.Type = type
            timeScale.IsEnabled = True
            TimeScales.Add(timeScale)
        End Sub

        Private Sub AddFixedTimeScale(ByVal caption As String, ByVal showHeaders As Boolean, ByVal scale As TimeSpan)
            Dim timeScale As TimeScaleViewModel = TimeScaleViewModel.Create()
            timeScale.Caption = caption
            timeScale.Scale = scale
            timeScale.ShowHeaders = showHeaders
            timeScale.Type = ScaleType.FixedTime
            timeScale.IsEnabled = True
            TimeScales.Add(timeScale)
        End Sub
    End Class

    Public Enum ScaleType
        WorkDay
        WorkHour
        FixedTime
    End Enum

    Public Class TimeScaleViewModel
        Public Shared Function Create() As TimeScaleViewModel
            Return ViewModelSource.Create(Function() New TimeScaleViewModel())
        End Function
        Protected Sub New()
        End Sub
        Public Overridable Property Caption() As String
        Public Overridable Property ShowHeaders() As Boolean
        Public Overridable Property IsEnabled() As Boolean
        Public Overridable Property Scale() As TimeSpan
        Public Property Type() As ScaleType
    End Class
End Namespace

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfSchedulerTimelineScalesTemplate"
        xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
        xmlns:dxmvvm="http://schemas.devexpress.com/winfx/2008/xaml/mvvm"
        xmlns:dxsch="http://schemas.devexpress.com/winfx/2008/xaml/scheduling" x:Class="WpfSchedulerTimelineScalesTemplate.MainWindow"
        mc:Ignorable="d"
        Title="Timeline View" Height="480" Width="640"
        DataContext="{dxmvvm:ViewModelSource local:MainViewModel}">
    <Window.Resources>
        <local:TimeScaleTemplateSelector x:Key="TimeScaleTemplateSelector">
            <local:TimeScaleTemplateSelector.WorkDayScaleTemplate>
                <DataTemplate>
                    <ContentControl>
                        <dxsch:TimeScaleWorkDay Caption="{Binding Caption}" ShowHeaders="{Binding ShowHeaders}" IsEnabled="{Binding IsEnabled}"/>
                    </ContentControl>
                </DataTemplate>
            </local:TimeScaleTemplateSelector.WorkDayScaleTemplate>
            <local:TimeScaleTemplateSelector.WorkHourScaleTemplate>
                <DataTemplate>
                    <ContentControl>
                        <dxsch:TimeScaleWorkHour Caption="{Binding Caption}" ShowHeaders="{Binding ShowHeaders}" IsEnabled="{Binding IsEnabled}"/>
                    </ContentControl>
                </DataTemplate>
            </local:TimeScaleTemplateSelector.WorkHourScaleTemplate>
            <local:TimeScaleTemplateSelector.FixedTimeScaleTemplate>
                <DataTemplate>
                    <ContentControl>
                        <dxsch:FixedTimeScale Caption="{Binding Caption}" ShowHeaders="{Binding ShowHeaders}" IsEnabled="{Binding IsEnabled}" Scale="{Binding Scale}"/>
                    </ContentControl>
                </DataTemplate>
            </local:TimeScaleTemplateSelector.FixedTimeScaleTemplate>
        </local:TimeScaleTemplateSelector>
    </Window.Resources>
    <Grid>
        <dxsch:SchedulerControl x:Name="scheduler" GroupType="None" Start="{Binding Start, Mode=TwoWay}" AllowAppointmentConflicts="True">
            <dxsch:TimelineView x:Name="timelineView" IntervalCount="8" TimeScalesSource="{Binding TimeScales}" TimeScaleTemplateSelector="{StaticResource TimeScaleTemplateSelector}"/>
            <dxsch:SchedulerControl.DataSource>
                <dxsch:DataSource AppointmentsSource="{Binding Appointments}" ResourcesSource="{Binding Calendars}">
                    <dxsch:DataSource.AppointmentMappings>
                        <dxsch:AppointmentMappings
                            Id="Id"
                            AllDay="AllDay"
                            Type="AppointmentType"
                            Start="Start" 
                            End="End" 
                            Subject="Subject" 
                            Description="Description"
                            Location="Location"
                            ResourceId="CalendarId"
                            RecurrenceInfo="RecurrenceInfo"
                            StatusId="Status"
                            LabelId="Label"/>
                    </dxsch:DataSource.AppointmentMappings>
                    <dxsch:DataSource.ResourceMappings>
                        <dxsch:ResourceMappings Id="Id" Caption="Name"/>
                    </dxsch:DataSource.ResourceMappings>
                </dxsch:DataSource>
            </dxsch:SchedulerControl.DataSource>
        </dxsch:SchedulerControl>
    </Grid>
</Window>

using System.Windows;
using System.Windows.Controls;
using System;

namespace WpfSchedulerTimelineScalesTemplate {
    public class TimeScaleTemplateSelector : DataTemplateSelector {
        public DataTemplate WorkDayScaleTemplate { get; set; }
        public DataTemplate WorkHourScaleTemplate { get; set; }
        public DataTemplate FixedTimeScaleTemplate { get; set; }
        public override DataTemplate SelectTemplate(object item, DependencyObject container) {
            TimeScaleViewModel timeScale = item as TimeScaleViewModel;
            switch (timeScale.Type) {
                case ScaleType.WorkDay: return WorkDayScaleTemplate;
                case ScaleType.WorkHour: return WorkHourScaleTemplate;
                case ScaleType.FixedTime: return FixedTimeScaleTemplate;
                default: throw new NotImplementedException();
            }
        }
    }
}

using DevExpress.Mvvm.POCO;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace WpfSchedulerTimelineScalesTemplate {
    public class MainViewModel {
        public virtual DateTime Start { get; set; }
        public virtual IEnumerable<TeamCalendar> Calendars { get; protected set; }
        public virtual IEnumerable<TeamAppointment> Appointments { get; protected set; }
        public virtual ObservableCollection<TimeScaleViewModel> TimeScales { get; protected set; }

        protected MainViewModel() {
            Start = TeamData.Start;
            Calendars = new ObservableCollection<TeamCalendar>(TeamData.Calendars);
            Appointments = new ObservableCollection<TeamAppointment>(TeamData.AllAppointments);
            CreateTimeScales();
        }

        private void CreateTimeScales() {
            TimeScales = new ObservableCollection<TimeScaleViewModel>();
            AddTimeScale("Work Day", true, ScaleType.WorkDay);
            AddTimeScale("Work Hour", true, ScaleType.WorkHour);
            AddFixedTimeScale("Half Hour", false, new TimeSpan(0, 30, 0));
        }

        private void AddTimeScale(string caption, bool showHeaders, ScaleType type) {
            TimeScaleViewModel timeScale = TimeScaleViewModel.Create();
            timeScale.Caption = caption;
            timeScale.ShowHeaders = showHeaders;
            timeScale.Type = type;
            timeScale.IsEnabled = true;
            TimeScales.Add(timeScale);
        }

        private void AddFixedTimeScale(string caption, bool showHeaders, TimeSpan scale) {
            TimeScaleViewModel timeScale = TimeScaleViewModel.Create();
            timeScale.Caption = caption;
            timeScale.Scale = scale;
            timeScale.ShowHeaders = showHeaders;
            timeScale.Type = ScaleType.FixedTime;
            timeScale.IsEnabled = true;
            TimeScales.Add(timeScale);
        }
    }

    public enum ScaleType { WorkDay, WorkHour, FixedTime }

    public class TimeScaleViewModel {
        public static TimeScaleViewModel Create() {
            return ViewModelSource.Create(() => new TimeScaleViewModel());
        }
        protected TimeScaleViewModel() { }
        public virtual string Caption { get; set; }
        public virtual bool ShowHeaders { get; set; }
        public virtual bool IsEnabled { get; set; }
        public virtual TimeSpan Scale { get; set; }
        public ScaleType Type { get; set; }
    }
}