WP8控件未显示

Question

我有一个WP8 Pivot应用程序并尝试在ProgressBar中插入TextBlock和Pivot Item，但它似乎没有显示。

<phone:PivotItem Header="Tweets">
    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <Grid.Resources>
                <DataTemplate x:Key="tweetlist">
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto" />
                            <RowDefinition Height="*" />
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto" />
                            <ColumnDefinition Width="*" />
                        </Grid.ColumnDefinitions>

                       <!-- I would like to have the Progress bar here -->
                       <!-- I would like to have the textblock here -->

                        <Rectangle Fill="Aqua" Height="50" Width="50" Grid.Row="0" Grid.Column="0"
                                   VerticalAlignment="Top" Margin="0,7,7,0"
                                   Grid.RowSpan="2">

                        </Rectangle>
                        <Image Height="50" Width="50" Grid.Row="0" Grid.Column="0"
                               VerticalAlignment="Top" Margin="0,7,7,0"
                               Grid.RowSpan="2" Source="{Binding Image}">

                        </Image>
                        <TextBlock Text="{Binding DateOfTweet}" Grid.Row="0" Grid.Column="1"
                                   Foreground="{StaticResource PhoneAccentBrush}" VerticalAlignment="Top" />

                        <TextBlock Text="{Binding Tweet}" TextWrapping="Wrap" Foreground="Black"
                                   Grid.Row="1" Grid.Column="1"
                                   VerticalAlignment="Top" />

                    </Grid>
                </DataTemplate>
            </Grid.Resources>
            <!--                    <TextBlock  Text="Tweet List" Foreground="Black" FontSize="26" HorizontalAlignment="Center" Margin="10" />-->
            <ListBox
                ScrollViewer.VerticalScrollBarVisibility="Visible"
                ItemTemplate="{StaticResource tweetlist}"
                x:Name="llsTweets" ItemsSource="{Binding Tweets}">
            </ListBox>
        </Grid>
    </phone:PivotItem>

我是如何实现这一目标的？

Answer 1

这是一个重叠问题。不要在网格的单元格中放置多个控件，如果不需要，请不要使用Grid.RowSpan。

使用stackpanel或子网格将单元格分解为更小的部分。