tabbed.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="appsmile.View.Approve">

    <ContentPage.Content>
        <StackLayout BackgroundColor="#a39898" >
            <AbsoluteLayout BackgroundColor="#ffffff" Padding="0,0,0,0" HeightRequest="150">
                <Image Source="logo"
                   BackgroundColor="Transparent"
                   HorizontalOptions="CenterAndExpand"
                   VerticalOptions="CenterAndExpand"
                   AbsoluteLayout.LayoutFlags="PositionProportional" AbsoluteLayout.LayoutBounds=".5,0,100,70" />
                <ImageButton Source="approve.png"
                     FlexLayout.AlignSelf="Center"
                     BackgroundColor="Transparent"
                     HorizontalOptions="CenterAndExpand"
                     VerticalOptions="CenterAndExpand"
                     AbsoluteLayout.LayoutFlags="XProportional" AbsoluteLayout.LayoutBounds=".5,75,100,65" />
            </AbsoluteLayout>
            <AbsoluteLayout BackgroundColor="#ffffff" Padding="0,0,0,0" Margin="0,-10,0,0">
                <Grid HorizontalOptions="FillAndExpand" Margin="0,10,0,0"
                      VerticalOptions="FillAndExpand"
                      ColumnSpacing="0"
                      RowSpacing="0"
                      Padding="0">

                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="Auto" />
                    </Grid.RowDefinitions>

                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*" />
                        <ColumnDefinition Width="*" />
                        <ColumnDefinition Width="*" />
                    </Grid.ColumnDefinitions>

                    <!-- Tab 1 -->
                    <StackLayout Grid.Row="0"  Grid.Column="0" VerticalOptions="FillAndExpand" >
                        <Button Clicked="Tab1Clicked" Text="NEED APPROVAL" BackgroundColor="#ffffff"/>
                    </StackLayout>

                    <!-- Tab 2 -->
                    <StackLayout Grid.Row="0"  Grid.Column="1" VerticalOptions="FillAndExpand">
                        <Button Clicked="Tab2Clicked" Text="APPROVED" BackgroundColor="#ffffff"/>
                    </StackLayout>

                    <!-- Tab 3 -->
                    <StackLayout Grid.Row="0"  Grid.Column="2"  VerticalOptions="FillAndExpand">
                        <Button Clicked="Tab3Clicked" Text="REJECT" BackgroundColor="#ffffff" />
                    </StackLayout>

                    <StackLayout Grid.Row="1"  Grid.Column="0" VerticalOptions="FillAndExpand" x:Name="line1" IsVisible="true">
                        <BoxView Color="Red" HeightRequest="2" />
                    </StackLayout>
                    <StackLayout Grid.Row="1"  Grid.Column="1" VerticalOptions="FillAndExpand" x:Name="line2" IsVisible="false">
                        <BoxView Color="Red" HeightRequest="2" />
                    </StackLayout>
                    <StackLayout Grid.Row="1"  Grid.Column="2" VerticalOptions="FillAndExpand" x:Name="line3" IsVisible="false">
                        <BoxView Color="Red" HeightRequest="2" />
                    </StackLayout>

                    <StackLayout x:Name="stkTab1" IsVisible="true">

                    </StackLayout>
                    <StackLayout x:Name="stkTab2" IsVisible="false">
                    </StackLayout>

                    <StackLayout x:Name="stkTab3" IsVisible="false">
                    </StackLayout>
                </Grid>
            </AbsoluteLayout>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>