WPF DataGrid CheckBox Check/Uncheck with single click

Hi,

I need check and uncheck of CheckBox using spacebar key in a single click.I tried like below.

<my:DataGridTemplateColumn Header="Chk" MinWidth="40">      
<my:DataGridTemplateColumn.CellTemplate>                            
<DataTemplate>                                
<CheckBox IsChecked="{Binding Path=SELECT,UpdateSourceTrigger=PropertyChanged}" Name="ChkSelect" 
Click="ChkSelect_Click" KeyDown="ChkSelect_KeyDown"/>                            
</DataTemplate>                        
</my:DataGridTemplateColumn.CellTemplate>                    
</my:DataGridTemplateColumn>

With mouse I am able to check/uncheck in a single click.But the same thing I am not able to do it with spacebar key.The key down event is firing only when I press tab key twice.How to achieve check/uncheck CheckBox in a single click using spacebar key?

cas