writing at multi-column listbox periodically

Question

Hi, I have a multi-column listbox (5 columns), and I want to overwrite each column in a periodical manner. I was wondering how can I do that. I was thinking of bringing the cursor back to the beginning of the listbox and start writing at index 0, without doing a ListBox.Item.Clear(), but was unable to get the cursor to the correct position. Advise, anybody? regards.