How to cs6 running background?

windows7 64bit

using .net(c#) , illustrator cs6 type library

in cs5, it's simple

application app = new application();

no options needed.

before running, set small small illustrator's window it's runs bakcground.

that's means no appear on taskbar, it's appear in task-manager proses.

but cs6 dosen't so.

it appear on taskbar.

and slow on proses cs5.

i think that,the proses because of can't work on background.

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