How to do a macro that start a function in a lua addon?

[tsatsa]

Sorry if it a repost from my other thread in the HB general forum, but i suppose there will be more ppl able to answer me in this section

let try to explain my problem...

TradeSkillMaster allows to cancel auctions that ppl undercutted me.

Before allowing to cancel them, it's required to click on a button in the TSM panel. The function into the lua should be:

function Cancel:StartScan()

How to use it in a wow macro, without clicking on the button?

I tried /run Cancel:StartScan() but it did worked​