The Alfabet Diagram Designer provides a Delete and Cut capability:

• The Delete button allows you to delete an object that has been created in the context of the Alfabet Diagram Designer. This is limited primarily to connection items such as information flows. Please note that objects such as applications and peripherals that have been added to the diagram cannot be deleted from the diagram. They can only be removed from the diagram via the Cut button.
• The Cut button allows you to remove an object from the diagram (such as applications, peripherals, etc.) as well as removed any shapes that have been added to the diagram. The Cut button will be disabled if you select a connection item. Connection items can only be removed if their connecting node (application, peripheral, etc) is also selected for the cut action. Any objects that have been removed via the Cut button are saved to a clipboard and can be returned to the diagram via the Paste button.