Handle multiple lookup levels on a single page.

On one of our pages, we have a three level dependancy that fills drop downs.  This comes from the object structure that determines relevant values based on related object records.  Here is the dependancy tree:
1. Object A - You select a company from the dropdown at the top of the page.

2. Object B - When you select an Object A, the Object B dropdown at the bottom is filled with relevant taxes available for that company record.

3. Object C - When you select an Object B, the dropdown for Object C is populated with relevant values for that state.

Observed (Wrong) Behavior

1. When you fail to fill out a required field (Fail Validation) the system repopulates the form with your values, but it clears out your value for the 3rd level dependancy - Object C