Datagrid binding with CheckBox

Hi,

I'm Roby Eisenbraun Martins.
I am trying to create a datagrid with a checkbox to select the fields and
the data from a datatable(dataset).
I tried following the Microsoft Help, but it doesn't work. Creating a new
bool style column in the datagrid without a mapping valid value from the
datatable doesn't appear in the datagrid.
So i tried creating a new column in the table before binding. All the
checkboxes column appear, but disabled. With no changes at all.
Please help!

(Microsoft Datagrid with CheckBox Help)
http://msdn.microsoft.com/library/de...stDataGrid.asp
Roby Eisenbraun Martins