Layout colour problem

[Gormo]

Hi, I have a problem with FormZ 8 Layout 64 bits.

 

I can't change the colour of a line from an imported model.

This only happens with imported lines, I can draw a new line above the imported one, and change the colour of that new line.

 

I'm not sure if there's an option that doesn't allow me to change colours of imported models or somethign like that.

 

Thanks