Run-Time error details

Hello

I'm writing a dll in C# 2010 and i want to fill the "Details" box in the Run-Time error popup in case of an error

I fill the ErrorMessage string in Teststand but in the popup box "Run-Time Error" it says "No details available"

How can i sent the ErrorMessage string to the "Details:" box in the "Run-Time Error" popup

This is an example of my C# code

public void LABPRN_ExecuteJob(ref bool ErrorOccured, ref int ErrorCode, ref string ErrorMessage)

        {

try

            {

        if (_sTmpFileHandle != null)

                {

                    _sTmpFileHandle.Close();

                    _sTmpFileHandle.Dispose();

                }

        //Rename file from .tmp to .job

               File.Move(sTmpPathName, _sJobPathName);

                _sTmpPathName = System.String.Empty;

                _sJobPathName = System.String.Empty;

            }

      catch (Exception ex)

            {

                ErrorOccured =true;

                ErrorCode = -1;

                ErrorMessage = ex.Message;

            }

        }

thanks in advance

Tonnie