How to perform Single click checkbox selection in WPF DataGrid?

Question

I have a DataGrid with first column as text column and second column as CheckBox column. What I want is, if I click the check box. It should get checked.

But, it takes two click to get selected, for first click the cell is getting selected, for the second clicks the check box is getting checked. How to make the check box to get checked/unchecked with a single click.

Note:I'm using WPF 4.0

Edit: Columns in the DataGrid are AutoGenerated.

Answer 1

This is for 3.5sp1, I know - but it should work under 4.0: Vinsibal.