I have a rich textbox and the Undo() and Redo() functions Used to work, and now they don't AT ALL.

From what I've done so far, I do not see any code in which would interfer with it working, it just doesn't anymore.

Is there something that wouldn't make it work, because form what I can tell I didn't do anything wrong....

Is there any other Undo()/Redo() functions I can use or am I going to have to make my own and if so, how exactly should I go about that?(Array of textboxes sounds the easyest but alto the most memory consuming method)