ALV OOP- Catching the event when the user clicks a cell

Hi Experts,

i have 2 alvs to display using custom containers, now the problem is that i need to make some lines uneditable and some lines editable. On making this i find that ALV does not offer this functionality of selective editable rows, right? I offered a workaround by just popping an error message if a user clicks a row which suppose to be disabled/uneditable. My problem is that how can i catch the single click event in ALV using OOP?

Thanks to replies and points will be given...