tag datwindow property object not functioning in background color

I am using 12.6 classic

I need to send to the column's of a Datawindow information to control the properties so that I can dictate the column's background color, The border, etc.

For example, I use the below to control the background property of a column.

if( right(customer_name, 1) = 'O', rgb(255,135,155), rgb(255,50,50))

The problem is that these codes I send with the customer's name display as well.

My attempted solution was to use the column's tag property

after sending information to the tag property I want to use the below in the background color of each column.

if( right(customer_name.tag, 1) = 'O', rgb(255,135,155), rgb(255,50,50))

but upon saving i get the error                DATAWINDOW

                                               Expecting true/false expression

I can also solve the problem even easier if I can just display the tag property of each column in my datawindow, leaving the value of the column to control the background and other column properties.