Dynamically change color of button based on data in visual table

[Orgel]

I have a button on a main page that links to a different tab.  I want the button to change color based on a field within the visual table in the linked tab.  For instance, this green dot is on a main page, and if you click on it, it brings you to a tab called PractifiPortalLastLogin.  I want the dot to change to red if there were any data in the ID field. I found a function to do this under the style drop down for the shape. 

However, in this function, it references the data field in the underlying data table which has much more data then my visual table.  My visual table is filtered to only be showing the maximum date time in the dataset.  So I want my conditional tool to just be referencing what is in the visual table, not the underlying data table if any of this makes sense.

[parry2k]

@Orgel try what I provided and then reply.

[Orgel]

Basically to have the dots change color based on what is in the visual table, not the underlying data table.

[parry2k]

@Orgel not fully understood but add a measure for color and then use that by clicking FX

Color =
IF ( CALCULATE ( COUNTROWS ( YourTable ), ALLSELECTED () ) >= 1, "Red", "Green" )