Searchbar in Navigation bar Or TabbedPage

Hi, I was having trouble trying to get a searchbar inside the navigation bar. Then i read it wasn't possible because it only accepts ToolBarItems.
So now im trying to put the searchbar at the top of a tabbedpage where the navigation bar was. But it wont let me put anything other than a page in the TabbedPage.

<SearchBar Placeholder="Search"/>
<TabbedPage.Children>

    <custom:ContactsTab Title="Contacts" Icon="contacts_icon.png"/>
    <custom:ConversationsTab Title="Conversations" Icon="conversations_icon.png"/>

</TabbedPage.Children>