app.popupmenu selection item

Hi, I have this code for a pdf form on Adobe LiveCycle:

var cRtn = app.popUpMenu(["Aménagement",["Paysage", "Plan", "Design"], "Structure"], "-","Gazon","Vegetable");

  if(cRtn)

  {

     console.println("Selected Entry: " + cRtn);

  }

I want the selection appears inside the box field, but when I click on one of the item, it does not appear inside the box. Someone can help me to resolve this issue? Thank you.