框架中的 GridSplitter；超越边界问题

Question

我有一个用于在 Silverlight RIA 应用程序中显示数据的通用视图。基本上，视图接受一个参数，该参数是 RIA 获取数据所需的查询，并且使用自动生成的字段显示数据。

以下是视图的 XAML 代码的一部分。

        <Grid Grid.Column="0">
            <Grid.RowDefinitions>
                <RowDefinition x:Name="DataGridRow"/>
                <RowDefinition Height="Auto"/>
                <RowDefinition x:Name="DataFormRow"/>
                <RowDefinition Height="Auto" x:Name="EditRow"/>
            </Grid.RowDefinitions>
            <ria:DomainDataSource Name="SQLDomainDataContext" LoadingData="SQLDomainDataContext_LoadingData" LoadSize="45" SubmittedChanges="SQLDomainDataContext_SubmittedChanges" SubmittingChanges="SQLDomainDataContext_SubmittingChanges" LoadedData="SQLDomainDataContext_LoadedData">
                <ria:DomainDataSource.SortDescriptors>
                    <ria:SortDescriptor Direction="Descending" PropertyPath="BaseProperties.CreatedOn" />
                </ria:DomainDataSource.SortDescriptors>
            </ria:DomainDataSource>
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition />
                    <RowDefinition Height="Auto"/>
                </Grid.RowDefinitions>
                <sdk:DataGrid  Grid.Row="0" AutoGenerateColumns="True" Name="dataGrid" ItemsSource="{Binding}" DataContext="{Binding Path=Data, Mode=TwoWay}" IsReadOnly="True" AutoGeneratingColumn="dataGrid_AutoGeneratingColumn" SelectionChanged="dataGrid_SelectionChanged" />
                <custCont:LocalizedDataPager Grid.Row="1" x:Name="pager" Source="{Binding Path=Data}" PageSize="15" DisplayMode="FirstLastPreviousNext" />
            </Grid>

            <Border Grid.Row="1">
                <Border.Background>
                    <LinearGradientBrush EndPoint="1,0.5" StartPoint="0,0.5">
                        <GradientStop Color="#FF9D9D9D" Offset="0" />
                        <GradientStop Color="#FFDBDBDB" Offset="1" />
                    </LinearGradientBrush>
                </Border.Background>
                <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
                    <Ellipse Fill="Black" HorizontalAlignment="Center" Width="4" Height="4" Margin="8,0"/>
                    <Ellipse Fill="Black" HorizontalAlignment="Center" Width="4" Height="4" Margin="8,0"/>
                    <Ellipse Fill="Black" HorizontalAlignment="Center" Width="4" Height="4" Margin="8,0"/>
                </StackPanel>
            </Border>
            <sdk:GridSplitter Grid.Row="1" HorizontalAlignment="Stretch" Background="Transparent" Opacity="0"/>

            <data:DataForm Grid.Row="2" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Name="DF" AutoCommit="False" 
                           DataContext="{Binding Path=Data, Mode=TwoWay}" ItemsSource="{Binding}" 
                           AutoGeneratingField="DF_AutoGeneratingField" EditEnded="DF_EditEnded" DeletingItem="DF_DeletingItem" Style="{StaticResource DataFormStyle}"/>

            <Grid Grid.Row="3">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition />
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="Auto"/>
                </Grid.ColumnDefinitions>
                <Button Grid.Column="0" Name="btnHideDF" Content="{Binding Source={StaticResource ApplicationResources}, Path=ApplicationStrings.ShowEntities_HideDfBtn}" MinWidth="10" Margin="2" Click="btnHideDF_Click" />
                <Button Grid.Column="2" Name="bRefresh" Content="{Binding Source={StaticResource ApplicationResources}, Path=ApplicationStrings.ShowEntities_RefreshBtn}" MinWidth="75" Margin="2" Click="bRefresh_Click" IsEnabled="{Binding Path=CanLoad}" />
                <Button Grid.Column="3" Name="btnCacnelChanges" Content="{Binding Source={StaticResource ApplicationResources}, Path=ApplicationStrings.ShowEntities_CancelChangesBtn}" Margin="2" IsEnabled="{Binding Path=HasChanges}" Click="btnCacnelChanges_Click" Visibility="Collapsed" />
                <Button Grid.Column="4" Name="bSubmit" Content="{Binding Source={StaticResource ApplicationResources}, Path=ApplicationStrings.ShowEntities_SubmitBtn}" MinWidth="75" Margin="2" IsEnabled="{Binding Path=HasChanges}" Click="bSubmit_Click" />
            </Grid>
        </Grid>

当视图显示在单个 Frame 中时，一切都很好。但是当它显示在具有两个框架的页面上时，奇怪的事情开始发生。如果用户抓住拆分器并将其一直移动到顶部，超出框架边界，DataForm 将无限扩展。这不是一个大问题，但它看起来很丑，并且使底部的按钮从视线中消失。

这是怎么回事？为什么会发生这种情况？我怎样才能防止这种行为？

Answer 1

显然我的谷歌能力很弱。

我今天发现了这个，它也描述了我遇到的完全相同的问题作为一个可能的解决方案。

不过，我没想到这是 SL 中的一个错误......