You can manage the settings on Grid Header Summary area in which are displayed column header summary cells through HeaderSummary object. You can display the grid header summary or specify the height and the default Style of all column header summaries.
Show or hide the grid header summary.
If specify HeaderSummary.height as a value greater than 0, it will be displayed in the corresponding size, and if smaller than 0, the size will be determined automatically according to the style.
Specify the height.
You can change to a height greater than minHeight by dragging the bottom boarder of head cell.
You can specify the default style of column header cells in grid header level.