Untick the Auto-Scroll button which is to the right of the zoom buttons, this prevents the chart from jumping to the latest bar which it otherwise does every time there’s a new tick (not a problem in the weekend, but oh so annoying during the week)
After that just roll to the left as far back as you want and then move forward one bar/candle at a time with F12.
If you have the same problem as me, you’ll find that half the new bar is visible even before you scroll forward. The fix is simple, unmaximize the MT4 window and shrick it just a tad and suddenly everything works.
I found a trade simulator a while back: 301 Moved Permanently
Maybe it can be of help, but scrolling by hand works just fine.