DataGrid problems

[yoyosh]

I will be very thankfull if you could help me by answering my questions according DataGrid:

1. Each time I fill all fields in last row, a new row is being created (automatically). How to turn this feature off? (I would like the user who wants to add new row, to press a button "new" located outside DataGrid, to add a new row ).

2. I want to allow the user to edit DataGrid (ReadOnly == false). How to get a data from the row, that has just been edited?

3. I would like to make 2 columns - one ReadOnly == false, second ReadOnly == true. I tried in such way:

 DataTable dt = new DataTable("Coordinates"); 

this.dgPnt.DataSource = dt;
dt.Columns.Add("X");

dt.Columns[0].ReadOnly = true;

but it doesn`t seem to work.

thank you in advance for any help