Data Grid View Use in Using C sharp

Question

Design as follows using data grid view ;


 Day  Period       Eng                        Tam        Mat         Sci       Soc         Hindi           Sports

 mon   1       combo box(all staff)


i want the output as follows in that data grid view ;


 Day  Period    Eng    Tam   Mat    Sci Soc    Hindi      Sports

                   
when i click using mouse in Tam subject cell when i press space key in keyboard that combo box want to visible in the tam subject and select  the staff.

 similarly when i click using mouse in Mat subject cell when i press space key in keyboard that combo box want to visible