To get the stop button to work on the first page as well, you have to create another button, find the stop case in the event structure, right click on the event structure border and select "Edit events...". Then, you have to click the + on the top to add another event to the case, select the new button from the list on the left and select the proper event for it (value change, mouse down). Event driven programming can be very powerful. Try searching the site for "events" and "tutorial".
However, like I said, doing this will only make your code more complicated. It's preferable to have the button outside the tab.
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