how to avoid item selection from extra blank space header in listview ?

Hi all,

I am using wpf Listview control in my c#. in this i am using GridViewColumn headers and taking some listview items.

when i am selecting the listview items it also selects the extra black space of list view item as shown in below image.

if i will select any listview item. my selection should appear till my last header (Age), as shown in red box in above image.

thanks in Advance :)

sumitk