How to add a blank new row to WPF DataGrid automatically when user start editing current row

I have a DataGrid bind with ObservableCollection<MydataObject> MyDatalist With all the default settings, if user change the focus from the DataGrid (e.g. clicked a button) while editing a cell, all the data showing in the DataGrid includes the one the user is editing are stored to MyDatalist, thi开发者_如何学运维s is great, but the user need to hit "Tab" (while in the last cell) or "Enter" to create a new row.

I want the DataGrid to generate a new row automatically when user start editing any cell of the last row. I have tried the CurrentCellChanged event and I can have the new row automatically created by doing this:

void dataGrid1_CurrentCellChanged(object sender, EventArgs e)
{
     dataGrid1.CommitEdit(); 
}

However, with this implemented, if user change the focus from the DataGrid (e.g. clicked a button) while editing a cell, the one that the user is editing is not stored to MyDatalist, How can I have this feature back with the new row automatically added?

OK here is a Binding.UpdateSourceTrigger Property set this solved my problem:

Binding="{Binding Path=field1, UpdateSourceTrigger=PropertyChanged}"