DataGrid gets locked on ValidationError

Hi,

 I am using a simple a ValidationRule on DatagridTextColumn. The Validation occurs properly so no issues there. If ValidationError occurs, then the whole DataGrid is locked (and that seems reasonable). The problem occurs when the row for which validation failed is removed from the DataGrid. The row in error gets removed, but somehow the other DataGrid rows still remains in a Locked(non editable) state even if there aren't any more rows failing the validation. Any ideas why DataGrid rows still remain locked. Here is relevant code for the DataGridTextColumn.

<DataGridTextColumn <DataGridTextColumn.Binding><Binding Path="Name" NotifyOnValidationError="True"
                 UpdateSourceTrigger="LostFocus"><Binding.ValidationRules><local:SomeValidationRule/></Binding.ValidationRules></Binding></DataGridTextColumn.Binding></DataGridTextColumn>

regards,

Nirvan.