Extend datagrid in silverlight 4

Hi does anyone knows what functions do I have to overwrite to make myDataGridEx(that derives from DataGrid) to use instead of: Da开发者_C百科taGridRow -> use DataGridRowEx, DataGridRowHeader -> use DataGridRowHeaderEx, DataGridRowHeader -> use DataGridRowHeaderEx, DataGridRowGroupHeader -> use DataGridRowGroupHeaderEx, DataGridColumnHeader -> use DataGridColumnHeaderEx, DataGridCell -> use DataGridCellEx

I will create and Extend the Ex classes.

It's impossible do that with simple overriding. You can download source code of toolkit, get project with DataGrid and change source code extending functionality.