Boundary menu

• "Preferences" menu item
• "Check" menu item
• "Single displacement + loads" menu item
• "In section (displacement)" menu item
• "In section (load)" menu item
• "Line loads" menu item
• "Distributed loads" menu item
• "Distributed loads for materials" menu item
• "Modify loads/single springs" menu item
• "Individual materials" menu item
• "(Materials) In section" menu item
• "Beams" menu item
• "Delete all" menu item
• "Single springs" menu item
• "Single springs in section"