Loop in subVI to be stopped by control in calling VI.

I have a loop in a subVI that is supposed to run untill a stop-button is pressed in the calling VI. This doesn't work due to data flow issues. It has coem to my attention that this can be done using references, invoke nodes and/or property nodes. How is this done?

The main program is a long series of events connected by an error wire. The image shows only the relevant function call.
Attachments:
ET_loop_PN.vi ‏80 KB
StopSwitch_connection.PNG ‏7 KB

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Subvi does not stop from the mainVi immediately when the stop button pressed in the mainVi

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I have a mainVi which has a subVi inside. I want to have a kind of emeregency stop button in my mainVi.
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please help me to solve this problem.
Attached you can find the Main and SubVI
Attachments:
Sample2 MainVI.vi ‏18 KB
Move_MINI Editted SubVI.vi ‏13 KB

This is basic dataflow. Any code is available to run as soon as data is present on all its inputs. No data is present at its outputs until all the code inside has completed.
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Loop in subVI to be stopped by control in calling VI.

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