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Language Reference
PREV-SIBLING Attribute
The previous entry in the list of persistent procedure handles, server handles, or widget handles, relative to a given handle.
Data Type: HandleAccess: ReadableApplies To: Asynchronous Request Object Handle, Browse, Button, Combo-box, Control-frame, Dialog-box, Editor, Field-group, Fill-in, Frame, Image, Literal, Menu-item, Radio-set, Rectangle, Selection-list, Server Object Handle, Slider, Socket Object Handle, Server-socket Object Handle, Sub-menu, Text, THIS-PROCEDURE System Handle (and all procedure handles), Toggle-box, WindowTable 59 summarizes the value of PREV-SIBLING for each relevant handle type.
If the given handle is the first handle in the list, PREV SIBLING assumes the value of an invalid handle. To check the validity of a handle, use the VALID-HANDLE function.
NOTE: A widget must first be realized before it can become part of the list. A hidden widget cannot become part of the list since it is not realized. A widget that is already part of the list can be hidden and it remains part of the list.
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