Delete an item from diagram

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First, you'll want to turn off item binding (Right click on the diagram, then untick "Bind Items"). This means that deleting something on the diagram won't delete it from your powerflow data. Now that binding is off, just click on items and then hit the delete key. You will need to delete anything connecting to a bus before you can delete that bus. Once you're done you can right-click on the diagram and tick the "Bind Items" box to return to the normal mode.