Just a quick addition to the above. The reason I ask is because I've copied the 'FieldServices_AddEditWorkOrder' screen and made a number of changes over a few days. I wanted to release those changes so copied my screen again but chose to replace the links for the original screen.
I noticed that the 'Add New' buttons from the 'FieldServices_Calendar' and 'FieldServices_WorkOrderList' still link to the original screen. Is this because the 'FieldServices_AddEditWorkOrder' screen is a pop-up.