Is your feature request related to a problem? Please describe.
I really like the default style of the Datagrid but I can't make my own default Datagrid Style base on the Handy Control one. I have see that the same problem is present for the ListView style, and maybe some others.

Describe the solution you'd like
It's possible to add a x:Key = DataGridBaseStyle (using the default naming of the other BaseStyle) to the DataGrid Style and then make it default <Style TargetType="DataGrid" BaseOn="{StaticRessource DataGridBaseStyle}"/>

Describe alternatives you've considered
A first alternative is to make all the changes on the <DataGrid/> Tag.
But Currently I have litterally copy/paste the default style and made the Changes I wanted.

PS : Sorry for this approximative English ! ^^