Generally speaking, in AutoCAD you either select one or more entities and choose a command -or- you choose a command and then select one or more entities. When you are finished with the command, AutoCAD returns to the previous state where nothing was selected. I have noticed a different behavior in Civil 3D when working with C3D objects. When you select an object and perform certain commands (such as properties), when you are done the object remains selected. Read more about Working with Selected Civil 3D Objects : Are they Selected or not?