How do you show a Report parameter prompt in the LL viewer (wpf)

Hi Everyone,
I have designed a report which contains a report parameter. In the designer, when viewing the report, I receive the prompt as expected. When this same report is opened in the Viewer control, Only the first record is displayed and no prompt is shown.

Is there a way to enable this via code? Do I need to create my own prompt and then pass the parameters?
Any help would be create. Thanks

Can you detail what data source you’re using? Usually, you shouldn’t get a prompt but rather a panel within the viewer (this is, using .NET):

image

Does this look different on your end? How do you print to the viewer control? A couple of screenshots and a few code snippets would be great for an analysis.