SMART datagrid v.1 > Classes > SeriesColumn
If it is true, it will get and store the value of fields which have been specified by fieldNames before using.
If it is false, it will get the values of specified fields again whenever necessary.
Defaults to false.
grid.setColumns([{
name: 'col1',
type: 'series',
fieldNames: 'field1,field5..field11,field20',
cached: true
},
...
]);