XAML ScrollViewer barra de rolagem problema oculto (Silverlight)

Question

Eu tenho esse problema estranho em que o conteúdo dentro de um visualizador de rolagem aumenta de tamanho, o visualizador de rolagem, em seguida, mostra é barra de rolagem horizontal. No entanto, a grade do ScrollViewer é, em última instância dentro não parece redimensionar o suficiente para mostrar a barra de rolagem.

Eu isolei o problema neste aplicativo de exemplo, basicamente, alguns XAML e algum código por trás para simular o aumento de tamanho do conteúdo.

Observe como a barra de rolagem para a direita não está correctamente mostrando quando você clica no botão de redimensionamento, eu adicionei alguns estofo para mostrar que a sua existência, mas não no lugar correto.

Se eu remover a linha superior parece funcionar.

Todas as ideias e obrigado rapazes e meninas avanço?

<UserControl x:Class="SilverlightApplication7.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
mc:Ignorable="d"
>
<Grid 
    ShowGridLines="True" 
    HorizontalAlignment="Stretch" 
    VerticalAlignment="Stretch"
>
    <Grid.RowDefinitions>
        <RowDefinition x:Name="DealHeaderRow" Height="Auto" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition x:Name="DealBarColumn" Width="Auto"></ColumnDefinition>
        <ColumnDefinition x:Name="MarketViewerColumn" Width="Auto"></ColumnDefinition>
        <ColumnDefinition x:Name="DealEditorColumn" Width="*" ></ColumnDefinition>
        <ColumnDefinition x:Name="InfoColumn" Width="Auto"></ColumnDefinition>
    </Grid.ColumnDefinitions>

    <ContentControl 
        x:Name="DealBarRegionContentControl"
        Grid.Row="0"
        Grid.Column="0" 
        Grid.RowSpan="2"
        VerticalContentAlignment="Stretch"
        HorizontalAlignment="Stretch"
        Margin="0">
        <TextBlock Text="DealBarRegion" Width="150" />
    </ContentControl>

    <ContentControl 
        Grid.Row="0"
        Grid.Column="1" 
        Grid.RowSpan="2"
        VerticalContentAlignment="Stretch"
        HorizontalAlignment="Stretch"
        HorizontalContentAlignment="Stretch">
        <Border Background="#FF9AF172">
            <TextBlock Text="MarketViewerRegion"  Width="150"  />
        </Border>
    </ContentControl>

    <ContentControl 
        Grid.Column="2" 
        Grid.ColumnSpan="2"
        Grid.Row="0"
        HorizontalAlignment="Stretch"
        HorizontalContentAlignment="Stretch" >
        <Border Background="#FFC1FC9F">
            <TextBlock Text="DealHeaderRegion"  />
        </Border>
    </ContentControl>

    <ContentControl 
        Grid.Column="2" 
        Grid.Row="1" 
        VerticalAlignment="Top"
        HorizontalContentAlignment="Stretch" 
        VerticalContentAlignment="Stretch">
        <Border Background="MistyRose" >
            <TextBlock Text="DealEditorRegion" />
        </Border>
    </ContentControl>

    <Grid
        Grid.Column="3" 
        Grid.Row="1" 
    >
        <ContentControl 
            x:Name="InfoRegionControl" 
            VerticalContentAlignment="Stretch"
            HorizontalAlignment="Stretch">
            <!-- without the padding here you can't see the scroll bar at all !! Its like the 
            scroll ScrollViewer isn't correctly calculating its width to include the scroll bar,
            or the grid isn't sizing at the points its visible??-->
            <Border Padding="0,0,9,0" MinWidth="200" x:Name="DealInfoControlPlaceHolder">
                <ScrollViewer  
                    HorizontalAlignment="Stretch" 
                    HorizontalContentAlignment="Stretch"
                    VerticalScrollBarVisibility="Auto" 
                    HorizontalScrollBarVisibility="Auto"  
                    >
                    <StackPanel x:Name="ScrollContentPlaceHolder">
                        <Button Click="Button_Click" Content="Rezize Column" x:Name="ResizeButton" />
                    </StackPanel>
                </ScrollViewer>
            </Border>
        </ContentControl>
    </Grid>
</Grid>

E aqui está o código por trás:

using System.Windows;
using System.Windows.Controls;

namespace SilverlightApplication7
{
    public partial class MainPage : UserControl
    {
        double _dealInfoControlPlaceHolderHeight = 0;
        double _dealInfoControlPlaceHolderWidth = 0;

        public MainPage()
        {
            InitializeComponent();

            Loaded += (o, e) =>
            {
                // cache the original width and height
                _dealInfoControlPlaceHolderHeight = DealInfoControlPlaceHolder.Height;
                _dealInfoControlPlaceHolderWidth = DealInfoControlPlaceHolder.Width;
            };
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if (ScrollContentPlaceHolder.Height == 1200)
            {
                ScrollContentPlaceHolder.Height = _dealInfoControlPlaceHolderHeight;
                ScrollContentPlaceHolder.Width = _dealInfoControlPlaceHolderWidth;
            }
            else
            {
                ScrollContentPlaceHolder.Height = 1200;
                ScrollContentPlaceHolder.Width = 250;
            }
        }
    }
}

Answer 1

Ok, eu não sei por que o acima não funciona, mas como uma solução Eu só reestruturar a página para seus comporta da mesma. Que as obras:

<UserControl x:Class="SilverlightApplication7.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
mc:Ignorable="d"
>
<Grid 
    ShowGridLines="True" 
    HorizontalAlignment="Stretch" 
    VerticalAlignment="Stretch"
>
    <Grid.RowDefinitions>
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition x:Name="DealBarColumn" Width="Auto"></ColumnDefinition>
        <ColumnDefinition x:Name="MarketViewerColumn" Width="Auto"></ColumnDefinition>
        <ColumnDefinition x:Name="DealEditorColumn" Width="*" ></ColumnDefinition>
    </Grid.ColumnDefinitions>

    <ContentControl 
        x:Name="DealBarRegionContentControl"
        Grid.Column="0" 
        VerticalContentAlignment="Stretch"
        HorizontalAlignment="Stretch"
        Margin="0">
        <TextBlock Text="DealBarRegion" Width="150" />
    </ContentControl>

    <ContentControl 
        Grid.Column="1" 
        VerticalContentAlignment="Stretch"
        HorizontalAlignment="Stretch"
        HorizontalContentAlignment="Stretch">
        <Border Background="#FF9AF172">
            <TextBlock Text="MarketViewerRegion"  Width="150"  />
        </Border>
    </ContentControl>

    <Grid
        Grid.Column="2" >
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>

        <ContentControl 
            Grid.Row="0"
            HorizontalAlignment="Stretch"
            HorizontalContentAlignment="Stretch" >
            <Border Background="#FFC1FC9F">
                <TextBlock Text="DealHeaderRegion"  />
            </Border>
        </ContentControl>

        <Grid 
            Grid.Row="1"     
            HorizontalAlignment="Stretch"
            VerticalAlignment="Stretch"
            >
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"></ColumnDefinition>
                <ColumnDefinition Width="Auto"></ColumnDefinition>
            </Grid.ColumnDefinitions>
            <ContentControl 
                Grid.Column="0"
                VerticalAlignment="Top"
                HorizontalContentAlignment="Stretch" 
                VerticalContentAlignment="Stretch">
                <Border Background="MistyRose" >
                    <TextBlock Text="DealEditorRegion" />
                </Border>
            </ContentControl>
            <ContentControl 
                Grid.Column="1"
                x:Name="InfoRegionControl" 
                VerticalContentAlignment="Stretch"
                HorizontalAlignment="Right">
                <!-- without the padding here you can't see the scroll bar at all !! Its like the 
                scroll ScrollViewer isn't correctly calculating its width to include the scroll bar,
                or the grid isn't sizing at the points its visible??-->
                <Border Padding="0,0,9,0" MinWidth="200" x:Name="DealInfoControlPlaceHolder">
                    <ScrollViewer  
                        HorizontalAlignment="Stretch" 
                        HorizontalContentAlignment="Stretch"
                        VerticalScrollBarVisibility="Auto" 
                        HorizontalScrollBarVisibility="Auto"  
                        >
                        <StackPanel x:Name="ScrollContentPlaceHolder">
                            <Button Click="Button_Click" Content="Rezize Column" x:Name="ResizeButton" />
                        </StackPanel>
                    </ScrollViewer>
                </Border>
            </ContentControl>
        </Grid>
    </Grid>
</Grid>