WPF

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()
{
}

public partial class AssignedEmployeesControl : _BaseUserControl
{
    public event RoutedEventHandler AssignmentRemoved;
}

private void addAssignedEmployeesColumn()
{
    // Assigned Employees Column
    DataGridTemplateColumn employeesColumn = new DataGridTemplateColumn();
    employeesColumn.Header = "Assigned Employees";
    employeesColumn.Width = new DataGridLength(1, DataGridLengthUnitType.Star); ;


    FrameworkElementFactory factory = new FrameworkElementFactory(typeof(AssignedEmployeesControl));

    factory.SetValue(AssignedEmployeesControl.EngineRefProperty, EngineRef);
    factory.SetValue(AssignedEmployeesControl.AssignmentShiftProperty, new Binding("Shift"));

    factory.AddHandler(AssignedEmployeesControl.AssignmentRemoved, new RoutedEventHandler(AssignmentRemoved));

    DataTemplate cellTemplate = new DataTemplate();
    cellTemplate.VisualTree = factory;

    employeesColumn.CellTemplate = cellTemplate;

    assignmentsGrid.Columns.Add(employeesColumn);
}

private void AssignmentRemoved(object sender, RoutedEventArgs e)
{
}

Argument 1: cannot convert from 'System.Windows.RoutedEventHandler' to 'System.Windows.RoutedEvent'	

The best overloaded method match for 'System.Windows.FrameworkElementFactory.AddHandler(System.Windows.RoutedEvent, System.Delegate)' has some invalid arguments

The event 'FMG.UI.WPF.Shared.Views.Controls.AssignedEmployeesControl.AssignmentRemoved' can only appear on the left hand side of += or -= (except when used from within the type 'FMG.UI.WPF.Shared.Views.Controls.AssignedEmployeesControl')