Dimension in FilterPane

[AdrianS1]

Hi guys, i have filter pane like this.

I have dimension Merchant->Brand

I want to show the brands in filter brand but after a click on some merchants.

i have function like this:

If(Match(MERCHANT_NAME, (GetFieldSelections(MERCHANT_NAME))),BRAND)

but it works only for one merchant, when i click on few merchants, the brand is not showing.

Any idea for better function ?

I dont want to build a casual dimension because i can see a brand without clicking merchant.

[Or · Accepted solution]

Perhaps something along the lines of:

If(GetSelectedCount(MERCHANT_NAME)>0,BRAND)