Use comboBox as source to group an autogenerate DataGrid
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**`ViewModel`**:
I want to select all `Persons`(which each person can be of `Type`: Employee , Manager or Customer)
and this is the only operation I want to let the `ViewModel` to do that.

**`View`**:
I want a `ComboBox` of `PersonTypes` and a `DataGrid` which is filtered based on selected `PersonType` of `ComboBox` (In another word,Id like to let the `ComboBox`to be the responsible of `DataGrid` `Grouping`) and would need do all in the `XAML`.

 Any suggestions?

Thank you.