Dynamic Data custom page Insert to parent/child clears our parent but not child listviews

Question

I'm new to Dynamic Data applications so please forgive me if this isn't clear. I have a custom page for an insert of a parent row. On that page at the bottom is a TabContainer with multiple tabs each with a ListView of a child table.

When I click to insert a row for the parent, it clears out the parent properly but in the TabContainer each tab/ListView contains all the rows for each child. What I would expect is that each ListView would be empty.

Has anyone seen this type of thing before? Any suggestions?