DataGridView can't replace DataGrid?

[Brett Romero]

I've written a DataGrid class that inhertis from DataGrid. There's a
lot of code in this class specific to the DataGrid's functionality. I
mainly want to use the DataGridView for drop down combo boxes. I
thought about creating another custom type class for DataGridView and
possibly use a composite class to bring in all of the CustomDataGrid's
functionality.

I was hoping to override the DataGridView's DataSource and assign to
the composite DataGrid.DataSource. Then somehow bubble the DataGrid
source up into the DataGridView where I would have the best of both
worlds - all the CustomDataGrid's functionality plus use of the
DataGridView. No...no...no!

The two are very different under the hood. A DataGridView can't lay on
top of a DataGrid.

So, if I want all of my CustomDataGrid's functionality plus new
features from the DataGridView, what is the best route?

Thanks,
Brett