C# 在windows phone 8.1中将LiveSDK登录按钮替换为自定义按钮

是否可以使用普通按钮控件并加载Microsfot帐户登录页面。不过，我可以使用lviesdk提供的sign按钮来实现这一点。但是用普通按钮我们怎么做呢

<liveControls:SignInButton Command="{Binding LiveAcntSessionChanged}"  Branding="MicrosoftAccount"
                                       Scopes="{Binding LiveScopeIds,Mode=OneTime}"  Height="70"
                                       ClientId="{Binding BClientId,Mode=OneTime}"  x:Name="btnLiveSignIn"
                                       TextType="Login" Content="Microsoft Account"  VerticalAlignment="Bottom" HorizontalAlignment="Right" 
                                       SessionChanged="btnLiveSignIn_SessionChanged" Margin="0,0,0,0"/>

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添加以下行已修复该问题

 if (loginResult.Status != LiveConnectSessionStatus.Connected)
     loginResult = await authClient.LoginAsync(new string[] { "wl.basic", "wl.offline_access", "wl.signin" });