DataGrid problems

[yoyosh]

First, thank you for help.

acording to 3) -> I tried to do everything as you said. I clicked into TableStyles and set one column with ReadOnly true and the other with false. (I can`t figure out what the mapping name is for exactly). Then I defined:

 
DataTable dt = new DataTable("Coordinates");
 

and in OnLoad method:

 dt.Columns.Add("X"); 
 
dt.Columns.Add("Y");
 
this.dataGrid1.DataSource = dt;

still both columns are editable...