A simple VI with a while loop and 2 buttons : the first button calls a second (similar vi), the second button exits. Running this vi and clicking the first button does not make the second vi panel appear ! Labview 6.02 on Win98SE, Dell Optiplex GX240
open the caller vi, click right button on icon of called vi and select in popup menu "SubVI node setup". In opened window select "Show FP when called" and "Close afterwards if originally closed".