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  • 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 the Mathematica book: Section 2.8.11.