<ContentPage.ToolbarItems>
   <ToolbarItem  Icon="logo.png" Activated="RefButtonClicked"></ToolbarItem>
</ContentPage.ToolbarItems>

var cancelItem = new ToolbarItem
{
    Text = "Cancel",
    Icon = "tabalilogo.png",
    Order = ToolbarItemOrder.Secondary
};

NavigationPage.SetHasNavigationBar(this, false);

<AbsoluteLayout x:Name="slToolbar"  Grid.Row="0" >
        <Button x:Name="Cancel" BackgroundColor="#ADD8E6" Image="cancel.png" Command="{Binding CancelClick}"  AbsoluteLayout.LayoutFlags="PositionProportional">
          <AbsoluteLayout.LayoutBounds>
            <OnPlatform x:TypeArguments="Rectangle" iOS="0, .5, 36, 36" Android="0, .5, 36, 36" WinPhone="0, .5, 50, 50" />
          </AbsoluteLayout.LayoutBounds>
        </Button>


        <StackLayout Orientation="Horizontal"  AbsoluteLayout.LayoutFlags="PositionProportional">
           <AbsoluteLayout.LayoutBounds>
            <OnPlatform x:TypeArguments="Rectangle" iOS="1,.5,110,50" Android="1,.5,50,36" WinPhone="1,.5,110,50" />
          </AbsoluteLayout.LayoutBounds>


          <ContentView >
            <OnPlatform x:TypeArguments="View">
              <OnPlatform.iOS>
                <Button   x:Name="NewIOS"  BackgroundColor="#ADD8E6" Image="ic_add.png" Command="{Binding AddNew}"  ></Button>
              </OnPlatform.iOS>
              <OnPlatform.WinPhone>
                <Button   x:Name="NewWP"  BackgroundColor="#ADD8E6"  Command="{Binding AddNew}"  Image="ic_add.png"/>
              </OnPlatform.WinPhone>
            </OnPlatform>
          </ContentView>


          <Button   x:Name="btnSave"  BackgroundColor="#ADD8E6" Image="check.png" Command="{Binding SaveClick}"   HorizontalOptions="End" ></Button>
        </StackLayout>
      </AbsoluteLayout>

<ContentPage>
<NavigationPage.TitleView>
    <StackLayout Orientation="Horizontal" VerticalOptions="Center" Spacing="10">
        <Image Source="iconXamagon.png">
            <Image.GestureRecognizers>
                <Image.TapGestureRecognizer
                    Tapped="HandleTapped" />
            </Image.GestureRecognizers>
        </Image>
        <Label Text="3.2.0" FontSize="16" TextColor="Black" VerticalTextAlignment="Center" />
    </StackLayout>
</NavigationPage.TitleView>
....