使用touchDown模拟Datagrid中的双击事件

i am new using WPF. I have a WPF Window with a datagrid wich launch a process when double click occurs. This work great, but when i do this in a tablet(with windows 7), using the touch screen, the process never happen. So i need to emulate the double click event with touch events. Any one can help me to do this, please?i am new using WPF. I have a WPF Window with a