To reorder objects within a message definition file:
Switch to the Broker Application Development
perspective.
Click the object that you want to move. For example,
you could select a local element within a message in either the Outline view
or Properties Hierarchy.
Use the mouse to drag the object to its new location.
Tip: As you drag the object and the mouse cursor passes between objects,
a black line appears, showing where the current focus is. If you try to drag
and drop the object to a location that it cannot be moved to (including objects
that are highlighted as the cursor passes over them), the object remains in
its original position when you release it.