[Haskell-beginners] Cannot Show Table

Hello, me, I am a very beginner. I build a GUI with Glade containing an input- and an output table as well as two buttons. My target is to take the user-input from the input table, process it and put the result to the output table. My first problem is to display the content from the input table for control. With " onClicked inButton (putStr "Hello, World!") " haskell works fine without errors. With " onClicked inButton (??? inTable) " I do not find the right command to display within Prelude. Thanks for help, Guenter inButton <- builderGetObject builder castToButton "button1"; outButton <- builderGetObject builder castToButton "button2"; inTable <- builderGetObject builder castToTable "table1"; --onClicked inButton (putStr "Hello, World!"); --0nly for testing onClicked inButton (??? inTable);