Creating model instances using pro program

Hello everyone! I am trying to create instances of a model but when I provide input and relation and save the .lst file I can't see the drop-down menu which consists of enter, input parameters. I am working in Creo 5.0, a back-end compiler flashes and disappears. When I click show design, a prompt says do you want to overwrite existing? All the model relations are erased from the .lst file
How can I fix this problem? Back end compiler just flashes and disappears. How to keep this back end compiler running in order to create dialog box using pro program?
Regards
Rohan