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GridDefaultElement
GridDefaultElement is an option for GridBox which specifies what to insert when a new element is created interactively in a GridBox.
The default setting for GridDefaultElement is "\[Placeholder]" or " ".
When creating palettes, GridDefaultElement is typically set to ButtonBox[" "].
The setting for GridDefaultElement is used to determine the contents of new columns or rows created with  , or    (Control-Return).
See Section 2.9.11.
New in Version 3.
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