Some objects can "own" other objects. Menus own menu items. In DISPLAY DEFINE, form fields are owned by forms. Option box form fields can own radio buttons. Frame form fields can own any other form field type, including other frames. If a new form field object is added within a frame, it is considered to be "owned by" that frame. The ownership relationships between objects are displayed in the structure chart. Many operations on an "owning" object also affect the "owned" objects. For example, if a frame object is moved, all objects which it owns move with it and maintain their relative positions within the frame. Object ownership relationships can be changed by manipulating the icons in the structure chart which represent the objects.
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About The Structure Chart