To simplify the operation of the program when designing the Layout,
the commands of edit and creation are only accessible within the
context in which they can work. Also within each context it will be
displayed only the elements of the layout that have meaning for the context.
To switch from a context to another, simply click on the tab that
contains the name of context.
In some situations you will notice that some contexts are disabled
and his commands are not accessible. This happens when you must
perform before some operations in other contexts enabled. For
example, if you don't complete the tasks of Area context, all other
contexts will be disabled.