How to execute a command from a NSIS finish page

After having tried various methods, i never got the finish page with a checkbox in it. Q&A on stackoverflow suggested to use the !define MUI_PAGE_FINISH_RUN command just before the !insertmacro MUI_PAGE_FINISH command. So I took the example WelcomeFinish.nsi and added only 1 line !define MUI_PAGE_FINISH_RUN "Notepad.exe" just before the !insertmacro MUI_PAGE_FINISH command. Still no checkbox on the finish page. What am i doing wrong? I am using Win7 Professional on a 64-bit machine