Further to my remarks about stalls... I was out doing airwork today in my TR182, and I tried using the ailerons (gently) in a full stall (yoke held fully back). As I expected (I've never tried before) the ailerons work normally. I didn't try full deflection since I didn't want to do a snap roll (or whatever it's called in the UK). In other words, although on aggregate the wings are stalled (past the peak of the C/L curve), the tips are not stalled. This after all is what they are designed to do.
I disagree with SSD's remarks about a stall at altitude - done correctly, you pull back and pull back, nailing the altitude, right up to the break, at which point there is nothing more to be done (except recover of course) - if you hold the stall at that point, you will get a highish sink rate and the nose will bob up and down, stalling and unstalling. But up to the break you can (pretty much by definition) hold altitude. Of course there are planes, such as the Cherokee, which have such a flat C/L curve that you never really experience a break even at full up elevator, so the only indication you have of stall is the sink rate.
n5296s