I am working on the 8051 with the AGDI uVersion3. After connecting to the 8051 target with UART, the STOP button is disabled when I press the GO/RUN button(that will call the GoCmd() function). At that time, the 8051 is running, but I can not press the STOP button to stop 8051. What can I do to enable the STOP button in running state? Any button control variable in AGDI should I konw?