Enhance DataTable component to support multiple-columns grouping.

[CuteLeon]

Is your feature request related to a problem? Please describe. Enhance DataTable component to support multiple-columns grouping.

Describe the solution you'd like Show a multiple selection control on top of DataTable to select multiple columns which are used to grouping by. Call BData.GroupItems() method and render BDataTableGroupedRows recursively.

Describe alternatives you've considered A good example like Excel PivotTable:

Additional context Null

[doddgu]

It could be a 2.0 feature. If you are interested, you can pr. And I'll change the issue's label.

[doddgu]

We need keep this issue open, for trace the feature status.