Windows Phone 進度條設置

 <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <StackPanel>
                <TextBlock FontSize="24" Text="請等候" Name="a" Visibility="Collapsed"/>
                <ProgressBar Name="bar" Visibility="Visible" Maximum="100" Minimum="0" Margin="0,40,0,0">
                    <ProgressBar.Foreground>
                        <LinearGradientBrush EndPoint="1,0.5" StartPoint="0,0.5">
                            <GradientStop Color="#ffd5d543" Offset="0"/>
                            <GradientStop Color="#ffa6fabc" Offset="0.37"/>
                            <GradientStop Color="#ff76bfe8" Offset="1"/>
                        </LinearGradientBrush>
                    </ProgressBar.Foreground>
                </ProgressBar>
                <Button Content="開始" FontSize="28" Margin="0,25,0,0" Click="Button_Click"/>
                <StackPanel.Resources>
                    <Storyboard x:Name="res" Completed="res_Completed" FillBehavior="Stop">
                        <DoubleAnimation Duration="0:0:6"
                                         Storyboard.TargetName="bar"
                                         Storyboard.TargetProperty="Value"
                                         From="0"
                                         To="100"/>
                    </Storyboard>
                </StackPanel.Resources>
            </StackPanel>
        </Grid>

     private void Button_Click(object sender, RoutedEventArgs e)
        {
            this.res.Begin();
            this.a.Visibility = System.Windows.Visibility.Visible;
        }

        private void res_Completed(object sender, EventArgs e)
        {
            this.a.Visibility = System.Windows.Visibility.Collapsed;
        }