Edit Page: PageFunction

http://msdn.microsoft.com/en-us/library/ms615540.aspx

Below is a simple sample.

PageFunction:

<PageFunction
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:sys="clr-namespace:System;assembly=mscorlib" 
    x:Class="NavigateSample.PageFunction1"
    x:TypeArguments="sys:String"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="300"
    Title="PageFunction1">
    <Grid>

    </Grid>
</PageFunction>

Show page and get result:

//Instantiate the edit page.
PageFunction1 editPage = new PageFunction1();
//Show the page.
this.NavigationService.Navigate(editPage);

//Get returned result.
string result;
editPage.Return += new ReturnEventHandler<string>((object obj, ReturnEventArgs<string> arg)=>
{
    result = arg.Result;
});