Flood filling issues in AS3

OK, this problem is kind of difficult to explain, but I'll try to make it as clear as possible. I use AS3 and something really annoying happens every time I try to zoom in and flood fill individual letters. Say I have 10 frames and I'm trying to fill a letter on the 4th one. If I accidentally fill something I don't want to and then click "undo," the window randomly scrolls to either the first or the last frame and then I have to find the frame I was working on again. I know this doesn't really impact the actual icon, but considering I have to click "undo" a LOT, it gets pretty frustrating after a while. Help is much appreciated. Thank you!