SMART datagrid v.1 > Classes > GridColumn
The display order of this column within Column Group if it is the column being displayed now, that is, if visible is true.
If it is not the displaying state, it will return -1. And, you can change the display location through this property, and if specify the value less than 0, visible will become false. If the specified value is greater than visibleCount of parent group, it will be adjusted to visibleCount - 1.
var col = grid.focusedColumn();
if (col) {
col.setDisplayIndex(col.displayIndex() + 1);
}