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

[tsatsa]

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