WP7水平列表框最后的项目正在切断

我得到这个令人沮丧的问题，我的列表框中的最后几个项目被切断。

我已经设置我的列表框滚动并水平显示。 我的ItemPanelTemplate包含一个VirtualizedStackPanel（当我使用一个普通的堆栈面板时，我的列表框只显示有限数量的项目，虚拟的显示除最后两个外的所有项目）

我必须指出，当我从水平到垂直改变这一切工作正常这里是我的XAML。

请帮忙

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<Grid Name="JumpTo" Visibility="Collapsed" Background="#FF0A0909" Opacity="0.95" > <TextBlock Text="Jump To"/> <ListBox ItemsSource="{Binding}" HorizontalAlignment="Left" Name="lbJumpTo" VerticalAlignment="Top" SelectionChanged="lbJumpTo_SelectionChanged" Height="248" Width="623" Margin="34,77,0,0" ScrollViewer.HorizontalScrollBarVisibility="Auto"> <ListBox.ItemsPanel> <ItemsPanelTemplate> <VirtualizingStackPanel Orientation="Horizontal"></VirtualizingStackPanel> </ItemsPanelTemplate> </ListBox.ItemsPanel> <ListBox.ItemTemplate> <DataTemplate> <StackPanel Orientation="Vertical" Width="200" Height="160"> <Grid x:Name="gridLoop" Height="90" Width="150" Background="{x:Null}"> <Grid.RowDefinitions> <RowDefinition /> <RowDefinition /> <RowDefinition /> <RowDefinition /> <RowDefinition /> <RowDefinition /> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition /> <ColumnDefinition /> <ColumnDefinition /> <ColumnDefinition /> <ColumnDefinition /> <ColumnDefinition /> <ColumnDefinition /> <ColumnDefinition /> </Grid.ColumnDefinitions> <Image Source="{Binding LoopDisplayMatrix[0][0]}" Grid.Row="0" Grid.Column="0" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[0][1]}" Grid.Row="0" Grid.Column="1" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[0][2]}" Grid.Row="0" Grid.Column="2" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[0][3]}" Grid.Row="0" Grid.Column="3" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[0][4]}" Grid.Row="0" Grid.Column="4" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[0][5]}" Grid.Row="0" Grid.Column="5" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[0][6]}" Grid.Row="0" Grid.Column="6" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[0][7]}" Grid.Row="0" Grid.Column="7" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[1][0]}" Grid.Row="1" Grid.Column="0" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[1][1]}" Grid.Row="1" Grid.Column="1" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[1][2]}" Grid.Row="1" Grid.Column="2" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[1][3]}" Grid.Row="1" Grid.Column="3" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[1][4]}" Grid.Row="1" Grid.Column="4" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[1][5]}" Grid.Row="1" Grid.Column="5" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[1][6]}" Grid.Row="1" Grid.Column="6" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[1][7]}" Grid.Row="1" Grid.Column="7" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[2][0]}" Grid.Row="2" Grid.Column="0" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[2][1]}" Grid.Row="2" Grid.Column="1" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[2][2]}" Grid.Row="2" Grid.Column="2" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[2][3]}" Grid.Row="2" Grid.Column="3" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[2][4]}" Grid.Row="2" Grid.Column="4" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[2][5]}" Grid.Row="2" Grid.Column="5" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[2][6]}" Grid.Row="2" Grid.Column="6" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[2][7]}" Grid.Row="2" Grid.Column="7" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[3][0]}" Grid.Row="3" Grid.Column="0" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[3][1]}" Grid.Row="3" Grid.Column="1" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[3][2]}" Grid.Row="3" Grid.Column="2" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[3][3]}" Grid.Row="3" Grid.Column="3" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[3][4]}" Grid.Row="3" Grid.Column="4" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[3][5]}" Grid.Row="3" Grid.Column="5" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[3][6]}" Grid.Row="3" Grid.Column="6" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[3][7]}" Grid.Row="3" Grid.Column="7" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[4][0]}" Grid.Row="4" Grid.Column="0" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[4][1]}" Grid.Row="4" Grid.Column="1" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[4][2]}" Grid.Row="4" Grid.Column="2" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[4][3]}" Grid.Row="4" Grid.Column="3" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[4][4]}" Grid.Row="4" Grid.Column="4" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[4][5]}" Grid.Row="4" Grid.Column="5" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[4][6]}" Grid.Row="4" Grid.Column="6" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[4][7]}" Grid.Row="4" Grid.Column="7" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[5][0]}" Grid.Row="5" Grid.Column="0" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[5][1]}" Grid.Row="5" Grid.Column="1" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[5][2]}" Grid.Row="5" Grid.Column="2" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[5][3]}" Grid.Row="5" Grid.Column="3" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[5][4]}" Grid.Row="5" Grid.Column="4" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[5][5]}" Grid.Row="5" Grid.Column="5" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[5][6]}" Grid.Row="5" Grid.Column="6" Width="20" Height="20"/> <Image Source="{Binding LoopDisplayMatrix[5][7]}" Grid.Row="5" Grid.Column="7" Width="20" Height="20"/> </Grid> <StackPanel Orientation="Vertical" Height="50" Width="100"> <TextBlock Text="{Binding LoopName}" Width="150" Height="40" /> <TextBlock Text="{Binding TempoDisplay}" Width="150" Height="40" /> </StackPanel> </StackPanel> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </Grid>