While toddlers aren't great at noting difference in situation, we've found it useful to designate one chair (a lower, more stable chair) that he can push around and use to get up to see what's going on on the counter. The "blue" chairs (dining chairs) or any others, for that matter, are not for standing on. DS2 is doing very well with that, but we also are using the key strategy of telling what he may do:
NO "No standing!"
YES "We use the white chair for standing" or "We sit at the table" Physical redirection/guidance is appropriate at this age, gently (re)seating them, etc.
Yes, they are trying at this age, aren't they? Wouldn't trade it for the world!