BPMN interrupting boudary event & expanded subprocess.

Hi,

I like to model an expanded sub-process with interrupting and some non-interrupting boundary events.

question 1 ; How can I visualize an expanded Sub-process in a process chain? I do not want a new diagram showing the internals of this sub-process since the sub process border will not be displayed.

question 2; Dragging a boundary event to an activity border displays a non-interrupting symbol boundary event symbol. Setting the interrupting property checkbox (with F5, properties) of this non-interrupting boundary event, so making the event interruptable, does not change the symbol's non-interrupting display.