WPF

public void LoadSchedule()
        {
            WindowManager windowManager = new WindowManager();
            SelSchedViewModel vm = new SelSchedViewModel();
            windowManager.ShowDialog(vm);
        }

public void Handle(ScheduleInfo message)
        {
            ScheduleName = message.ScheduleName;
            FileInfo = message.FileLocation;
        }

public class ScheduleInfo
    {
        public string ScheduleName
        {
            get;
            private set;
        }

        public string FileLocation
        {
            get;
            private set;
        }

        public ScheduleInfo(string SN, string FL)
        {
            ScheduleName = SN;
            FileLocation = FL;
        }
    }

public string ScheduleName
        {
            get { return _scheduleName; }
            set {
                _scheduleName = value;
                NotifyOfPropertyChange(() => ScheduleName);
            }
        }
        public string FileInfo
        {
            get { return _fileInfo; }
            set {
                _fileInfo = value;
                NotifyOfPropertyChange(() => FileInfo);
            }
        }

public ShellViewModel()
        {
            IEventAggregator events = new EventAggregator();
        }

SelSchedViewModel vm = new SelSchedViewModel(events);

ObservableCollection<ConnectionViewModel> _connections;
private ICollectionView CV { get; set; }

public ConnectionsTabViewModel()
{
    _connections = new ObservableCollection<ConnectionViewModel>();
    CV = CollectionViewSource.GetDefaultView(_connections);
}

public void Sort()
{
    if (CV is ListCollectionView view)
    {
        view.CustomSort = new ConnectionViewModelComparer();
    }
}


public void StopSorting()
{

   if (CV is ListCollectionView view)
   {
       view.IsLiveSorting = false;
       //view.CustomSort = null;
    }
}

<StackPanel Orientation="Vertical">

<pre>
<RadioButton Content="Labor/Equipment"
        GroupName="builderTypeEntry"
        IsChecked="{Binding BuilderType, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

<RadioButton Content="Labor/Equipment &amp; Hardware"
        GroupName="builderTypeEntry"
        IsChecked="{Binding BuilderType, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

<RadioButton Content="Labor/Equipment, Hardware, &amp; Trusses"
        GroupName="builderTypeEntry"
        IsChecked="{Binding BuilderType, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

<RadioButton Content="Labor/Equipment, Hardware, Trusses, &amp; Lumber"
        GroupName="builderTypeEntry"
        IsChecked="{Binding BuilderType, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

private int _BuilderType;
public int BuilderType
{
    get { return _BuilderType; }
    set
    {
        if (_BuilderType != value)
        {
            _BuilderType = value;
            RaisePropertyChanged("BuilderType");
        }
    }
}

<ComboBox ItemsSource="{Binding Items}"<br />
            SelectedItem="{Binding SelectedItem}"
            DisplayMemberPath="Caption"
            SelectedValuePath="{Binding SelectedItemId, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">

<pre>
<ComboBox.ItemContainerStyle>
    <Style TargetType="{x:Type ComboBoxItem}" 
            BasedOn="{StaticResource {x:Type ComboBoxItem}}">

        <Style.Triggers>
            <DataTrigger Binding="{Binding Caption}" Value="">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type ComboBoxItem}">
                            <Separator HorizontalAlignment="Stretch" IsEnabled="False"/>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </DataTrigger>
        </Style.Triggers>

    </Style>
</ComboBox.ItemContainerStyle>

<ComboBox Grid.Row="0"
            Grid.Column="3"
            FontSize="14"
            HorizontalAlignment="Left"
            VerticalAlignment="Center"
            MinWidth="250"
            ItemsSource="{Binding Company.CompanyTypes}"
            SelectedValuePath="{Binding SelectedCompanyTypeId, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
            IsEnabled="{Binding AreFieldsEnabled}"
            Margin="3">

<pre>
<ComboBox.ItemContainerStyle>
    <Style TargetType="{x:Type ComboBoxItem}"
            BasedOn="{StaticResource {x:Type ComboBoxItem}}">

        <Style.Triggers>
            <DataTrigger Binding="{Binding Caption}" Value="">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type ComboBoxItem}">
                            <Separator HorizontalAlignment="Stretch"
                                        IsEnabled="False"/>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </DataTrigger>
        </Style.Triggers>

    </Style>
</ComboBox.ItemContainerStyle>

<ComboBox.ItemTemplate>
    <DataTemplate>
        <StackPanel Orientation="Horizontal">
            <CheckBox IsChecked="{Binding IsSelected}"
                        Margin="2"
                        HorizontalAlignment="Left"
                        VerticalAlignment="Center"/>
            <TextBlock Text="{Binding Caption}"
                        Margin="2"
                        HorizontalAlignment="Left"
                        VerticalAlignment="Center"/>
        </StackPanel>
    </DataTemplate>
</ComboBox.ItemTemplate>