Arguments: x
Returns true if its argument is a dialog-item
(i.e. control suitable to be placed on a dialog) and returns nil otherwise.
Common Graphics and IDE documentation is described in About Common Graphics and IDE documentation in cgide.htm.
The documentation is described in introduction.htm and the index is in index.htm.
Copyright (c) 1998-2000, Franz Inc. Berkeley, CA., USA. All rights reserved.
Created 2000.10.5.