I have three problems with the MS Datagrid.

1.) When i change the value in in cell, changes are not written to the Datatble until i move to the next row.
Is there a way to write the change to the Datatable when i move to the a new cell in the same row or force the changes to be written to the datatable.

2.) I have expression columns, and have almost the same problem, i change a value in a cell, but the expression column is not refreshes until i move to the next row.

3.) This is weird, not sure if it is a Datagrid or DataTable problem.
I have a master detail form, i am using databinding, i have an dataadater to fill the detail table, this dataadapater has a parameter which is the primary key of the master table. this is what i do:
-add a new record through the currency manager in the master table
-Clear Datatable
-Cancel changes and call Datatable clear method and fill it again.
-I get an error that says that i will have duplicate rows and it show repeated rows, but the table doesn't have repeated keys.

It looks like the Datatable is not being cleared.

This only happens if i have one record in the Master table.

If i have two records in the Master table, i don't have this problem.