windows phone panaroma隱藏控制項之後selectionchanged會出現此控制項閃動消失的問題

使用panaroma控制項，

 <controls:PanoramaItem Foreground="{StaticResource MainTitle}" Header="我的帳號">                <Grid Height="650" Margin="12,0,0,0" VerticalAlignment="Top">                    <Grid x:Name="userHomeLogined" Visibility="Collapsed">                        <Grid.RowDefinitions>                            <RowDefinition Height="150"></RowDefinition>                            <RowDefinition Height="*"></RowDefinition>                        </Grid.RowDefinitions>                        <Grid Grid.Row="0">                            <StackPanel Orientation="Horizontal">                                <Image Stretch="None" Source="/Image/UserHome/uploadphoto.png"></Image>                                <TextBlock Margin="0,12,0,0" Text="某個使用者"></TextBlock>                            </StackPanel>                        </Grid>                        <ListBox x:Name="userHomeMenu" Grid.Row="1">                            <ListBoxItem>                                <StackPanel Height="40" Orientation="Horizontal">                                    <Image Source="/Image/userhome/collection.png"></Image>                                    <TextBlock x:Name="accountRemain" Tap="accountRemain_Tap" Margin="12,0,0,0"  Foreground="{StaticResource HubBackground}" Text="我的餘額"></TextBlock>                                </StackPanel>                            </ListBoxItem>                        </ListBox>                    </Grid>                    <StackPanel x:Name="userHomeUnLogin" Orientation="Vertical">                        <TextBlock Text="使用者名稱/郵箱/會員帳號"></TextBlock>                        <TextBox BorderThickness="1" BorderBrush="Gray" Width="400" Style="{StaticResource TextBoxStyle1}">                        </TextBox>                        <TextBlock Text="密碼"></TextBlock>                        <TextBox  BorderThickness="1" BorderBrush="Gray"  Width="400" Style="{StaticResource TextBoxStyle1}">                        </TextBox>                        <Button x:Name="login" Click="login_Click" Width="200" Height="100" Background="{StaticResource HubBackground}" Content="登入" Style="{StaticResource ButtonStyle1}"></Button>                        <HyperlinkButton Foreground="{StaticResource HubBackground}" Content="如果沒有帳號,請點擊這裡註冊" Name="register" />                    </StackPanel>                </Grid>            </controls:PanoramaItem>

我要在使用者點擊登入之後將userHomeUnLogin隱藏，將userHomeLogined顯示，如果使用

 

userHomeUnLogin.Visibility = System.Windows.Visibility.Collapsed;
userHomeLogined.Visibility = System.Windows.Visibility.Visible;

在拖動panaroma之後，userHomeUnLogin還會閃動一下，然後消失，

解決方案

    userHomeUnLogin..Children.Clear();            userHomeLogined.Visibility = System.Windows.Visibility.Visible;