SMART datagrid v.1 > Classes > RowGroup
If it is true, it will display the icon button which expands and closes the group in merged cell of Merge Mode or group header.
It specifies button color by expanderStyles.
Defaults to true.
$('#toggleExpander').click(function (e) {
var visible = grid.rowGroup().expanderVisible();
grid.rowGroup().setExpanderVisible(!visible);
});