I guess you are trying to Expand the entire master table rows and hence expose the Detail table. If so you can try the following code snippet to achieve the desired scenario.
That sort of works for me. Setting the display to false hid the column but for some reason made it really wide. Lets say when the column was visible its width was 10px, when i hid it the empy space became more like 100px. So instead of hiding it programmatically i hid it throught style sheet by adding this to top of my page