Go into /usr/share/applications
and find the .desktop file for your application. (It will probably be displayed as just an icon if you use a file manager to do this. Part of mine looks like this, but the files are really called [something].desktop)
Copy it into /home/[your-user-name]/.local/share/applications
Open the .desktop file with your favorite text editor and look for the line starting with Categories=
Change this line so it reads Categories=Development;
and save the file.
Your menu may refresh immediately; if it doesn't, open a terminal and type lxpanelctl restart