lineedit,combobox in tablewidget

hi ,
im new to qt
im using 4.5 in x11;
i want to create combobox,lineedit in a table.
but i dont know where to start with.
which will be best suit for my requirement [QTableview or QTableWidget] [or i have to use subclassing the delegates?]

my req:
i want to hav a 2 cols
one empty row
on double clicking in the col0 in empty row, combo box have to displayed.
on entering in combo the value passed to current cell.

on double clicking in the col1 in empty row, lineedit have to be displayed.[combo will be hidden]
on entering in lineedit value passed to current cell.[lineedit will be hiden]

any help plz
Thnkz
Beams