Class diagram in tree notation

Question

I  have

@startuml

abstract class ClassA{

}

class ClassB extends ClassA{

}

class ClassC extends ClassA{

}

@enduml

I get a Picture with two arrows, but I want a tree notation like this

Explain here:https://www.ibm.com/developerworks/rational/library/content/RationalEdge/sep04/bell/

 

Answer 1

Please see http://forum.plantuml.net/6818 for temporary solution.