Datagrid grouping same item into multiple groups?

[ttustonic]

Hello
Is it possible to group the same item into multiple groups with the DataGrid?
For example, if a person works on multiple projects I'd like him shown in all the projects?
Or, put the same task item in the 'today', 'this week', 'this month' groups, something like Firefox history?
Standard .Net grid with ListCollectionView can do it, but I can't find a way to do this with this DataGrid.

Thanks, Tom