EventView.xaml

<UserControl x:Class="DXBindingExample.View.EventView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:v="clr-namespace:DXBindingExample.View"
             xmlns:vm="clr-namespace:DXBindingExample.ViewModel"
             xmlns:dxmvvm="http://schemas.devexpress.com/winfx/2008/xaml/mvvm"
             xmlns:sys="clr-namespace:System;assembly=mscorlib"
             mc:Ignorable="d" d:DesignHeight="600" d:DesignWidth="800"
             d:DataContext="{dxmvvm:ViewModelSource vm:EventViewModel}">

    <UserControl.Resources>
        <sys:String x:Key="loadedBindingStringFormat" xml:space="preserve">This message is shown with this binding:&#13;{0}</sys:String>
        <sys:String x:Key="loadedBinding">Loaded="{DXEvent '$MessageBox.Show(`text`, Title)'}"</sys:String>
        <sys:String x:Key="clickBindingStringFormat" xml:space="preserve">This message is shown with this binding:&#13;{0}</sys:String>
        <sys:String x:Key="clickBinding">Click="{DXEvent '$MessageBox.Show(`text`, Title)'}"</sys:String>
    </UserControl.Resources>
    <StackPanel Orientation="Vertical" Loaded="{DXEvent '$MessageBox.Show($string.Format(@r(loadedBindingStringFormat), @r(loadedBinding)), Title)'}">
        <Button Content="Show Message" Style="{StaticResource valueStyle}" HorizontalAlignment="Left"
                Click="{DXEvent '$MessageBox.Show($string.Format(@r(clickBindingStringFormat), @r(clickBinding)), Title)'}"/>
    </StackPanel>
</UserControl>