Conditional format for the multi selected Parameter Field

Hi.

I would like to make one Dax formula that makes the change color of the column header.

The column header was created by the Parameter Field function like below.

Parameter Column Header = {

     ("Customer Name", NAMEOF(_CUSTOMER[Name]), 1),

     ("Product", NAMEOF(_ITME[Item], 2),

     .

     .

     .

}

In this case I would like to add one conditional format to change the colour of the Column Header, when I only take _CUSTOMER(Name). Actually when I select both the _CUSTOMER(Name) and _ITEM[Item],

the table should show a different colour for both the _CUSTOMER[Name] and _ITEM[Item] or _CUSOMER[Name]

I have tried some Dax formulas but show me the errror message.

Can you support me????