Here below is a sequence diagram that describes how a user signs in to an application:

How can I display these three classes from top to bottom rather than from bottom to top? Thus, C1 (and C1a), then C2, then C3, following the order in the code?

Now I have a capability card in plantuml. I have a huge number of elements and in order for the map to be readable, I made connections “obj1″ -[hidden]->”obj2” To arrange objects in a hierarchy from top to bottom.
Current code:

I would like to use mindmap style arrows in non-mindmap diagrams.

I try to make nice picture with plantuml and 1 component inside another with some internal and external interfaces. Output is ugly with overlapping object and text in my example.