I would like to launch a Command After the Export File Form Closes

[MiguelVJC82W]

I have a custom button that launches the DXF Export window. I would like to be able to Launch another method after the Export window is closed. Currently my code opens the Export Form and then launches my other method, but I need the second method to process using information from the form. Is there a way to do this that I am just not seeing? 

using Autodesk.Revit.UI;
using Autodesk.Revit.DB;
using System;
using Autodesk.Revit.Attributes;
using Autodesk.Revit.UI.Events;
using System.Windows.Forms;
using System.Xml.Linq;

namespace Ribbon
     {
      [Transaction(TransactionMode.Manual)]
      [Regeneration(RegenerationOption.Manual)]

      class CmdComboGroup : IExternalCommand
       {

          public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
            {

             CmdDFX2PDF n = new CmdDFX2PDF();
             n.Execute(commandData, ref message, elements);

             CmdCAD r = new CmdCAD();
             r.Execute(commandData, ref message, elements);

             return Result.Succeeded;

          }

    }
}

[jeremy_tammik]

The standard Revit API approach to launch a command after the previous one has been completed is to use the Idling event:

• https://www.revitapidocs.com/2023/56145d84-e948-730a-dc72-2a7b88a50a99.htm
• https://thebuildingcoder.typepad.com/blog/about-the-author.html#5.28

However, there are other possibilities as well. For example, check out these recent discussions on similar topics:

• https://forums.autodesk.com/t5/revit-api-forum/can-you-chain-idling-events/m-p/11484370 
• https://forums.autodesk.com/t5/revit-api-forum/exporting-to-dwg-after-dynamo-script-being-executed/m...