Multiple selection in Datagrid w/o RowHeaders

Hi All,

I'm developing an app where I have a situation wherein I need to allow users to select multiple rows of a DataGrid without using RowHeaders. I need to give users all the facilities of selecting multiple rows of the grid using CTRL button and clicking the rows in the grid but I can't use the RowHeaders (this is the client's requirement). Can somebody help me in this... I know there is a Select method of a grid which allows to select a whole row but how will I be able to know which row of the grid user has selected???

Thanks.
Debsoft