When you show the properties, you should be able to "set left click action:" to allow you to run something like "xfterm4 -e htop" or whatever the person wants. Reproducible: Always Steps to Reproduce: 1. 2. 3.
even hard coded to launch xfce4-taskmanager would be an improvement
(In reply to comment #1) > even hard coded to launch xfce4-taskmanager would be an improvement > hard coded is never an improvement, but a 'click action' would be cool!
Maybe a [l|m|r]-click option can be added to the xfce4-panel libraries? That way a plugin may only have to configure what action to take, and the panel handles the launch of that command?
(In reply to comment #2) > [...] a 'click action' would be cool! That feature has been added in revision 3238.
The command field only accepts a limited amount of characters which is too few if you want add a longer command like e.g.: Terminal --title=htop --geometry=103x62 -e htop
The number of characters is now unlimited. I also added check boxes for "run in a terminal" and "use startup notification". The default command is set to xfce4-taskmanager