DataGrid Cell Update late

[andrewcw]

I have a data time picker that's activated when a user
clicks on the date column, the value is driven to my
DataGrid immediately: [ But unless the user then
navigates to another column and row the update does not
display.] What do I do more to force the DataGrid to
update immediatley when the value is changed ?? Thanks !
private void dateTimePicker_ValueChanged(object sender,
System.EventArgs e)
{
QCDG[paperDate.iRowIndex,paperDate.iColIndex]=mydate;
QCDG.Refresh();
}