Hi Keith,
You might want to consider another approach than checkboxes in this situation, 
depending on what you want to do with the checked row.  If you just want to 
carry out some processing on the data in the selected row, you can use the 
dghilitedline property of the datagrid to find out which row the user has 
clicked on and take whatever action you want.  Make sure the multiple lines 
property  for the datagrid is not selected and use the selectionChanged event 
to check the dghilitedline.  If there are multiple things you might want to do 
with the selected row, use a popup menu activated by a right click (more 
complicated).

Pete Haworth

On Mar 7, 2011, at 2:55 AM, Keith Clarke wrote:

> BTW For this list, I want these Row-Select checkboxes to be 
> mutually-exclusive - so that if one is set to true, those in all other rows 
> are cleared. Where should I place such a script - against the _ColumnData_ 
> object or the data grid group level?


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