Found the answer!
Before you can look at the Controls property of the DynamicDetailContainer you need to bind to the Databound event and access it from within the DataBound event.
First, I overrode the OnInit event and then setup an event to call on DataBound of the DynamicDetailContainer.
.detailContainer.DataBound += detailContainer_DataBound;
Second, inside of the DataBound event handler I can now access the Controls property of the DynamicDetailContianer.
sender, EventArgs e)
var c = (Literal)
// ... more code ...
Hopfully this will be helpful for others that are having this same issue.