Xamarin表单:如何在MasterDetail工具栏上添加控件

我正在Xamarin Forms中创建一个主详细信息页面.我想在左上方显示菜单"图标，在右上方显示搜索器"，并在菜单栏上显示另一个标签.

I am creating a master detail page in Xamarin Forms. I want to have Menu icon on top left, searcher on the right and another label on the menu bar.

有什么可以帮助我完成工作的方法吗?我添加了菜单图标.我需要有关在工具栏/菜单栏/导航栏上添加其他控件的帮助，无论它叫什么.其位于主详细信息页面顶部的栏.

Can some help help me with how I can be done? I added the menu icon. I want help with adding other controls on the toolbar/Menubar/Navigation bar what ever it is called. Its the bar on top of the master detail page.

代码:

<?xml version="1.0" encoding="UTF-8"?>
<MasterDetailPage xmlns="http://xamarin.com/schemas/2014/forms" 
        xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" 
        xmlns:prism="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
        xmlns:local="clr-namespace:PCL.Core.Views;assembly=PCL.Core"
        prism:ViewModelLocator.AutowireViewModel="True" 
        x:Class="PCL.Core.Views.RootPage" MasterBehavior="Popover" >
    <MasterDetailPage.Master>
        <local:MasterPage/>
    </MasterDetailPage.Master>
    <MasterDetailPage.Detail>
        <NavigationPage BarBackgroundColor="Maroon" >
            <x:Arguments >
                <local:DetailPage />
            </x:Arguments>
        </NavigationPage>
    </MasterDetailPage.Detail>
</MasterDetailPage>

谢谢.