Setting visibility value of Effect-ActivityDiagram

[pisokol]

I write addin (in c#). Addin adds new diagram (Activity Diagram) with same diagram objects (Actions, connectors...). Diagram Objects have set value the Effect properties. I have problem with setting visibility this parameter on diagram.
I want obtain these results as set box "Show Effect in diagram" in Properties window for diagram object (element Action).
Anybody knows, how can I set it, using API, in my addin? Where it is set in EA object structure?
thx

[qwerty]

You need to add "ShowBeh=1;" to the element style.

q.

[pisokol]

Thx, You are THE BEST it's works.

[qwerty]

Thanks Meanwhile I have a little laboratory where I can find such things rather quickly.

q.