How to implement single and continuous run?

Hi All:

I add two controls on front panel, a "single" button, and a "continuous " one.

When "single" is pressed, the sub VI will execute only once.

But when "continuous" is pressed, the sub VI will execute continously.

I think I can use a while event structure , which captures the button events,

for "single button clicked event ", I just put sub VI  into the diagram.

For "continuous" condition, I will circle the sub VI with a while loop, inside the event diagram.

But now the problem is :  how should I wire the stop button for this while loop?

I think it should stop as soon as "single " button clicked, because now I am going to switch to "single" state.

Maybe I should wire the single button to the stop button? 

Do you have other solutions?

Any suggestions will be greatly appreciated. Many thanks.