how do i disable a stop button within an event

Using LabView 8.6 I'd like to disable my vi's stop button so the user can't stop the vi unless the network application is in the correct mode of operation.

I only want the user to be able to stop the vi when it is ok to do so. What I tried works to prevent the stop button from operating at the wrong time but the vi does not always stop and I have to force the vi to stop.

My event structure handles all the buttons and inputs for my vi. The event structure is within the while loop that generates commands for the network application when I click on one of the buttons or enter a value into a input field. Another while loop is reading data from the network application and displaying the data on the vi. I used a "Stop" local value to stop the display while loop.

How am I supposed to disable the stop button but have my vi stop when it is ok to do so in the correct way?