Thank you two for the help.
@Pascal, right click on anywhere of the status bar wouldn't call up any context menu.
@taazz, strange, your approach should work, but it doesn't on my system, strange, I can see the status bar of the editor flashes when the command is being executed. screenshot of my configuration:
https://screenpresso.com/=xyKqeI tried both the Lazarus 1.80 RC3 and 1.90 built by fpcudelux few weeks ago.
I use win 7 (with latest updates).