Navbar color-on-scroll bug when adding ngIf

[Nexmind]

Hello !
I have somes issues with the color-on-scroll attribute.

I have start from the example in the Paper Kit project, and modify three things in the component:

1. remove nav-down class in the nav-bar
2. modify the color-on-scroll attribute and set it to 20 (no matter the value i put, the color change always at the same pixel)
3. create a navbar service (because i must deal with 2 navbar) and add a *ngIf="!nav.visible" in my html on my nav tag

The real problem is when I put this *ngIf, the color change doesnt work anymore.

[chelaruc]

@Nexmind What code do you use for color-on-scroll?