ion-list-header background is not gray on iOS - ionic-framework

I am using a code like this in ionic 2.0.0rc4
<ion-list>
<ion-list-header>My Header</ion-list-header>
<!-- rest of ion-items -->
</ion-list>
In the documentation examples, list header's background is gray but in my app it has a white background! I don't know what is going on!
Any idea?
Cheers!

As per documentation, following SASS variable is used to set the list header background for ios $list-ios-header-background-color and its default value is transparent.
If you look closely, in the documentation also, color is coming grey for iOS and white for android & windows phone.
hope this helps.

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