Hide or Disable Row Selection Indicator on a grid using PeopleCode

Hi, guys,

I have a grid on the page where initially I will allow user to select the checkbox (Row Selection Indicator, not a field) on the grid to choose rows. After saving, I would like to disable that check box or hide it. But I don't seem to find a way to do it. It's not one of the columns on the grid so no way to address it. I can't disable the page either b/c I need other buttons to work. If I can disable grid, that will work for me too.

I can only think of adding a column of my own for the checkbox. But I prefer if there is a way to work on the row selection indicator.