Commented Unassigned: Not able to select all row of Datagrid [20736]

Can't able to select all row by Ctrl+A ,there are some rows which are missing from selection when i press Ctrl+A in datagrid.
Any suggestion
Comments: ** Comment from web user: BoucherS **

You should not modify the core controls ( DataGridControl, DataRow, Column... ) since the "SelectAll" of rows should be working by default. I believe the problem is more in the DataGridRow ,DataGridTextColumn or DataGrid or others user classes.