The Application Express engine dynamically renders and processes pages based on data stored in database tables. To view a rendered version of an application, you run or submit it to the Application Express engine.
You cannot run Modal and Non-Modal dialog pages directly using the Save and Run Page button. To view a Modal and Non-Modal dialog page, run the normal page that is responsible for opening the dialog page and access it from there.
To run a page in Page Designer:
You preview a page by running it. Running an application page displays the rendered version as end users would see it.
A rendered version of the application page appears.