Some fixes around pyramids and the gui

[sponce]

More precisely :

• the pyramid command did not work due to a missing parameter in a function call
• the dropdown menus were not working in the gui due to them missing in the gui handler associated

[sfan5]

Your patch didn't actually work because of two things:

• If you just changed the dropdown value it would already do the operation
• You forgot fields. in front of the names

Thanks for making a pull anyway, it spared me from needing to find where to fix what.