I thought OnSetEditText was fired whenever text in a cell changed. After setting a breakpoint and experimenting, I know that's wrong :-) So, first, when is this event fired?
Second, if I would like to have the text inside a grid cell continuously autosized, which event should I be coding to make this happen (note: I am using TMS's string grid derivative which includes a method for autosizing rows; I just have to figure out when to call it)?