The help button uses Xdialog which is the simplest method,
but be sure to put an ampersand character (&) at the end so that gtkdialog window
isn't affected.
Code: Select all
<button><label>Help</label><input file stock="gtk-info"></input><action>Xdialog --title "DC URI calc help" ......... 0 0 &</action></button>