Customizing the metamodel : Keywords for USRPROPS : UNORDERED
  
UNORDERED
Prevents list values from being sorted in the definition editor.
Example
LIST "DM2r activityChangesResource Behavior"
{
VALUE "Creates"
VALUE "Changes"
VALUE "Consumes"
}
By using the UNORDERED keyword, as shown below, the list values are displayed in the definition editor in the same order as the list above.
DEFINITION "ActivityChangesResource (DM2r)" RELATIONSHIP LABEL "activityChangesResource" REVERSELABEL "resourceChangedByActivity"
{

PROPERTY "Behavior"{ EDIT TEXT LISTONLY LIST "DM2r activityChangesResource Behavior" DEFAULT "Creates" UNORDERED ZOOMABLE LENGTH 200}
}
The result in the definition editor is shown below: