<UserControl x:Class="VulcanGUI.UtilityDialogs.Views.ErrorDialog"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
         xmlns:prism="http://prismlibrary.com/"
         prism:ViewModelLocator.AutoWireViewModel="True"
         Height="200" Width="300">
  <Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="141*"/>
        <RowDefinition Height="59*"/>
    </Grid.RowDefinitions>
    <dx:SimpleButton Grid.Row="1" Content="OK" Command="{Binding OKCommand}" CommandParameter="{Binding RelativeSource={RelativeSource AncestorType=Window}}" HorizontalAlignment="Left" Height="39" Margin="83,10,0,0" VerticalAlignment="Top" Width="137" FontWeight="Bold" FontSize="20"/>
    <TextBlock Grid.Row="0" Text="{Binding Message}" TextAlignment="Center" HorizontalAlignment="Center" Margin="66,10,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Height="121" Width="224" FontWeight="Bold" FontSize="18"/>
  </Grid>
</UserControl>

using System.Windows;
using System.Windows.Input;

namespace VulcanGUI.UtilityDialogs.ViewModels
{
  public class ErrorDialogViewModel : DialogViewModelBase
  {
    public ErrorDialogViewModel()
    {
        this.okCommand = new RelayCommand(OnOkClicked);
    }

    private string _message;
    public string Message
    {
        get { return _message; }
        set
        {
            SetProperty(ref _message, value);
        }
    }

    private ICommand okCommand = null;
    public ICommand OKCommand
    {
        get
        {
            return okCommand;
        }

        set { okCommand = value; }
    }

    private void OnOkClicked(object parameter)
    {
        CloseDialogWithResult(parameter as Window, DialogResult.Yes);
    }
  }
}

using Prism.Mvvm;
using System.Windows;

namespace VulcanGUI.UtilityDialogs
{
  public abstract class DialogViewModelBase : BindableBase
  {
    public DialogResult UserDialogResult
    {
        get;
        set;
    }

    public void CloseDialogWithResult(Window dialog, DialogResult result)
    {
        this.UserDialogResult = result;
        if (dialog != null)
            dialog.DialogResult = true;
    }
  }
}

private void LoadJobErrorNotification(string errMsg)
    {
        var vm = new ErrorDialogViewModel() { Message = errMsg };
        var result = DialogService.OpenDialog(vm);
    }