Prevent showing specific pop-up windows in Revit

Developers
,
1

Hi all!

I have just created my first Add-in for Revit which will help me to do a simple selection.
I know it sounds weird, but using basic Revit selection it is not possible (as far as I know) to select insulation of the ducts or pipes. Using my add-in, I can simply select pipe with its insulation and filter it out afterwards.

The problem I need to solve is a pop-up window which appears when I run my add-in and hit ESC right away without making any elements selection.
What is the best way to prevent of showing that window? All I want is Revit to terminate my add-in in the background without any pop-up windows as per my attachment below.

Thanks.

image

Code that I have atm:

namespace RevitAddin
{
    [Transaction(TransactionMode.Manual)]
    public class Command : IExternalCommand
    {
        public Result Execute(
          ExternalCommandData commandData,
          ref string message,
          ElementSet elements)
        {
            UIApplication uiapp = commandData.Application;
            UIDocument uidoc = uiapp.ActiveUIDocument;
            Application app = uiapp.Application;
            Document doc = uidoc.Document;

            try
            {
                // Use the rectangle picking tool to identify model elements to select.
                IList<Element> pickedElements = uidoc.Selection.PickElementsByRectangle("Select by rectangle");
                if (pickedElements.Count > 0)
                {
                    // Collect Ids of all picked elements
                    IList<ElementId> idsToSelect = new List<ElementId>(pickedElements.Count);
                    foreach (Element element in pickedElements)
                    {
                        idsToSelect.Add(element.Id);
                    }

                    // Update the current selection
                    uidoc.Selection.SetElementIds(idsToSelect);
                }


                return Result.Succeeded;
            }
            catch (Exception e)
            {
                message = e.Message;
                return Result.Failed;
            }
        }
    }
}