SMART datagrid v.1 > Classes > GridStyles
The size of the top border of cell.
It can be specified by a constant value or percentage value or null. If do not specify this value, it will be drawn by adjusting to the width of cell. If set as less than the height of cell, it will be displayed by adjusting to the horizontal center.
Defaults to null.
column.header().styles().setTopSize(66);
// or
column.header().styles().setTopSize('60%');