Add Content to Custom Entity Screen Using .NET API

I have a requirement to show child records on a parent record's screen, similar to the way quote lines are displayed on a quote screen. The parent and child entities are custom entities.

(I'm fairly new to Sage CRM and just getting started with the .NET API, so bear with me as I carry some assumptions forward from previous CRM systems.)

Is it possible to append content (child record list) to an existing page/screen (parent record) for a custom entity using the .NET API? How is the parent page/screen object instantiated in code?

If this is not possible, can a custom page/screen be created that overrides the ones created when I created the entity?

Another possibility may be to create a custom screen, like the 'Quick Look' example in the SDK, in the context of the Company entity. Header records have a company context, and could be shown on a new tab on the company form. But this would require a second list on the page to show the child records and then somehow filter the child record list based on the selected parent record.

Thanks for any suggestions you may have.

-Paul