Display of parametric cell

Hi

I've followed the steps from this link to create a parametric cell with an attached part. https://communities.bentley.com/products/building/building_analysis___design/w/building_analysis_and_design__wiki/40981/how-to-create-parametric-objects-using-cel-parametric

On placement it honers the level color, but if I change one of the parameters for the cell, the color changes to white (see video). 

Why is this? Can I do something about it? 

Regards, 

Robert