WPF

<Window x:Class="TicketWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Ticket Window" Height="300" Width="300"
        WindowStyle="None" ShowInTaskbar="False">

    <WindowChrome.WindowChrome>
        <WindowChrome CaptionHeight="{Binding ActualHeight,ElementName=titlebar}"/>
    </WindowChrome.WindowChrome>
    <DockPanel LastChildFill="True">
        <Border Background="{DynamicResource {x:Static SystemColors.ScrollBarBrushKey}}" DockPanel.Dock="Top" Height="25" x:Name="titlebar">
            <TextBlock Text="{Binding Title, RelativeSource={RelativeSource FindAncestor,AncestorType=Window},FallbackValue=Title}" 
                       Margin="10,0,0,0"
                       VerticalAlignment="Center">
                <TextBlock.Effect>
                    <DropShadowEffect Color="White" ShadowDepth="3"/>
                </TextBlock.Effect>
            </TextBlock>
        </Border>
        <Border BorderBrush="LightGray" BorderThickness="1" Padding="4">
            <TextBlock><Run Text="Window content"/><InlineUIContainer>
            		<Button Content="Button" Width="75" Click="Button_Click"/>
            	</InlineUIContainer></TextBlock>
        </Border>
    </DockPanel>
</Window>

Private Sub Button_Click(sender As Object, e As RoutedEventArgs)
     Try
         Dim thread As New Thread(AddressOf ChangeTitleBarColor)
         thread.Start()
     Catch ex As Exception
         Dim m As String = ex.Message
     End Try
 End Sub

Private Sub ChangeTitleBarColor()
    Try
        titlebar.Dispatcher.Invoke(Threading.DispatcherPriority.Render, Sub()
                                                                            titlebar.Background = Brushes.Green
                                                                        End Sub)
        Thread.Sleep(500)
        titlebar.Dispatcher.Invoke(Threading.DispatcherPriority.Render, Sub()
                                                                            titlebar.Background = Brushes.Red
                                                                        End Sub)
        Thread.Sleep(500)
    Catch ex As Exception
        Dim m As String = ex.Message
    End Try
End Sub

Private Sub ChangeTitleBarColor()
        Try
            titlebar.Dispatcher.Invoke(Threading.DispatcherPriority.Render, Sub()
                                                                                titlebar.Background = Brushes.Green
                                                                                Thread.Sleep(500)
                                                                                titlebar.Background = Brushes.Red
                                                                            End Sub)
        Catch ex As Exception
            Dim m As String = ex.Message
        End Try
    End Sub

Private Sub ChangeTitleBarColor()
       Try
           While True
               titlebar.Dispatcher.Invoke(Threading.DispatcherPriority.Render, Sub()
                                                                                   titlebar.Background = Brushes.Green
                                                                               End Sub)
               Thread.Sleep(500)
               titlebar.Dispatcher.Invoke(Threading.DispatcherPriority.Render, Sub()
                                                                                   titlebar.Background = Brushes.Red
                                                                               End Sub)
               Thread.Sleep(500)
           End While
       Catch ex As Exception
           Dim m As String = ex.Message
       End Try

public partial class AssignedEmployeesControl : _BaseUserControl
{
    public static readonly RoutedEvent AssignmentRemovedEvent =
        EventManager.RegisterRoutedEvent("AssignmentRemoved",
        RoutingStrategy.Bubble, typeof(RoutedEventHandler),
        typeof(AssignedEmployeesControl));

    public event RoutedEventHandler AssignmentRemoved
    {
        add { AddHandler(AssignmentRemovedEvent, value); }
        remove { RemoveHandler(AssignmentRemovedEvent, value); }
    }

    protected void OnAssignmentRemoved()
    {
        RaiseEvent(new RoutedEventArgs(AssignmentRemovedEvent));
    }

<DataGridTemplateColumn Header="Assigned Employees"
                        Width="*">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>

            <vc:AssignedEmployeesControl EngineRef="{Binding 
                                    ElementName=employeeJobAssignmentsView, Path=EngineRef}"
                                    AssignmentShift="{Binding Shift}">

                <i:Interaction.Triggers>
                    <i:EventTrigger EventName="AssignmentRemovedEvent">
                        <i:InvokeCommandAction 
                           Command="{Binding ElementName=employeeJobAssignmentsView, 
                           Path=AssignmentRemovedCommand}"/>
                    </i:EventTrigger>
                </i:Interaction.Triggers>

            </vc:AssignedEmployeesControl>

        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

private ICommand _AssignmentRemovedCommand;
public ICommand AssignmentRemovedCommand
{
    get
    {
        if (_AssignmentRemovedCommand == null)
            _AssignmentRemovedCommand = new RelayCommand(p =>
                assignmentRemovedExecuted(), p => assignmentRemovedCanExecute());
        return _AssignmentRemovedCommand;
    }
}

private bool assignmentRemovedCanExecute()
{
    return true;
}
private void assignmentRemovedExecuted()
{
}