Cimbalino appbar, blinking while changing pages

Question

Every time, when i'm navigating to the page with minimized appbar, or to the page without appbar, i see weird blinking at the bottom of the page.

First page is like this

But when transaction starts, i see black background

And its lasts during all transaction

How to set that background to white?

EDIT: tried to set appbar's opacity.. well, sometimes it works, but sometimes not. I have it like this

<Grid>
****
    <interactivity:Interaction.Behaviors>
        <cimbalino:ApplicationBarBehavior>
            <cimbalino:ApplicationBarIconButton 
                Click="MyEvent"
                IconUri="/Resources/Icons/appbar.add.png"
                Text="{Binding Path=MainResources.Add, Source={ StaticResource LocalizedStrings}}"/>
        </cimbalino:ApplicationBarBehavior>
    </interactivity:Interaction.Behaviors>
</Grid>



<phone:PhoneApplicationPage.ApplicationBar>
    <shell:ApplicationBar 
        Opacity="0.99"
        BackgroundColor="{StaticResource OurBestColor}"
        ForegroundColor="Black">
    </shell:ApplicationBar>
</phone:PhoneApplicationPage.ApplicationBar>