Xamarin.Forms Tabbed Items bar /w on click color change events

gistfile1.txt

                <StackLayout Orientation="Horizontal" Margin="0" Padding="0" VerticalOptions="Start">
                    <StackLayout Margin="0,0,0,0" Padding="0" VerticalOptions="StartAndExpand" HorizontalOptions="CenterAndExpand">
                        <Button Clicked="ButtonPosts_Clicked" Command="{Binding ListAllPostsCommand}" Image="fa_burger.png" HeightRequest="20" VerticalOptions="StartAndExpand" Margin="15" HorizontalOptions="CenterAndExpand"/>
                    </StackLayout>
                    <StackLayout Margin="0,0,0,0" Padding="0" VerticalOptions="StartAndExpand" HorizontalOptions="CenterAndExpand">
                        <Button Clicked="ButtonPosts_Clicked" Command="{Binding ListVideosCommand}" Image="fa_videos.png" HeightRequest="20" HorizontalOptions="CenterAndExpand" Margin="15" VerticalOptions="StartAndExpand"/>
                    </StackLayout>
                    <StackLayout Margin="0,0,0,0" Padding="0" VerticalOptions="StartAndExpand" HorizontalOptions="CenterAndExpand">
                        <Button Clicked="ButtonPosts_Clicked" Command="{Binding ListStatsCommand}" Image="fa_charts.png" HeightRequest="20" VerticalOptions="StartAndExpand" Margin="15" HorizontalOptions="CenterAndExpand"/>
                    </StackLayout>
                    <StackLayout Margin="0,0,0,0" Padding="0" VerticalOptions="StartAndExpand" HorizontalOptions="CenterAndExpand">
                        <Button Clicked="ButtonPosts_Clicked" Command="{Binding MoreCommand}" Image="fa_more.png" HeightRequest="20" VerticalOptions="StartAndExpand" Margin="15"  HorizontalOptions="CenterAndExpand"/>
                    </StackLayout>
                </StackLayout>