The Workspace Toolbar might be the most important toolbar of all : it displays in great details the content of your application.

All the items in the list are classified in order, from the application to the object : applications contain frames, which contain objects.
You can select any item in the tree, and its properties will appear in the property toolbar for you to modify them. You can also cut / copy / paste / clone / delete frames directly in this toolbar. A click with the right mouse-button will open the popup menu relative to the item you clicked on.
It is also possible to drag & drop frames and objects in this window : simply use you mouse as you would do for any drag & drop operation.