Possible Values

Absolute

The size is an absolute value in points.

Proportion

The size is assigned proportionally between all rows/columns with a Propertion metric. The space divided is the total size available to the grid less all Absolute and Auto sized rows/columns.

Auto

The size is calculated based on the content of the cells.

Default

This is the mode used if none is specified. It will behave as Auto if the layout size is unavailable, and will behave as Proportion if available (when the grid is stretched).