How to display ANSI z535 properly using DITA

How do I create ANSI z535 compliant messages in our machine manuals using the <hazardstatement> and <messagepanel> elements in structured FrameMaker 2015? 

Using unstructured FrameMaker, I created ANSI-compliant messages easily by defining the needed style sheets for NOTICE, CAUTION, WARNING, and DANGER.

Using DITA in structured Frame 2015, the results don't display in a manner compliant with ANSI. 

Can I achieve the results I need by modifying the EDD?  Should I use a text inset (ugh!)?