How are FMEOMessageLevel's CallBack supported in WPF?

FME privode C# codes  , as follows:

 

public void LogCallBack(FMEOMessageLevel severity, String message)

 

      {

 

 

         // Following code to ensure thread safety to avoid the

 

         if (this.LogOutputTextBox.InvokeRequired)

 

         {

 

            Invoke(new FMEO_LogCallbackFunc(LogCallBack),

 

                                            FMEOMessageLevel.Inform,

 

                                            message);

 

         }

 

         else

 

         {

 

            LogOutputTextBox.AppendText(message + Environment.NewLine);

 

         }

 

      }

 

 

I need to port this to WPF, but InvokeRequired has been removed by wpf? How to rewrite in WPF?