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.

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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.