Gutters are the spaces between columns and rows. The DikeGrid definition could or could not draw a line at the center of these spaces.
Horizontal Gutters
Horizontal Gutters are the vertical space between rows, and it has 3 pixels of height. The DikeGrid definition always draws a line of one-pixel width at the center of this vertical space.
Neither the vertical space nor the horizontal line is customizable in size.
Vertical Gutters
Vertical Gutters are the horizontal space between columns. By default, Vertical Gutters have 5 pixels in width.
You can provide an input flag called verticalRowLines to the DikeGrid, and it could draw a line of one-pixel width at the center of this horizontal space.
Neither the horizontal space nor the vertical line is customizable in size.
Let us bind the related property from the gridProperties object to display the vertical lines per row.