当其他列子项折叠时调整 WPF 网格列的大小？

我有两个控件Grid，并且需要制作一个来填充所有Grid另一个获得后的空间Collapseded，我不知道什么Container我可以使用吗，我试过了StackPanel and DockPanel我也是，但找不到好的解决方案。这是我的代码：

<Grid>
 <Grid.ColumnDefinitions>
    <ColumnDefinition Width="auto"/>
     <ColumnDefinition Width="auto"/>
 </Grid.ColumnDefinitions>
 <TextBox Grid.Column="0" Visibility="{Binding Istxt1Visible}"/>
 <TextBox Grid.Column="1" Visibility="{Binding Istxt2Visible}"/>
</Grid>

使用转换器怎么样？例如

在窗口资源中

<Window.Resources>
    <local:VisibilityToColumnLengthConverter x:Key="visConv" />
</Window.Resources>

.....

<Grid >
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="{Binding ElementName=tb1, Path=Visibility, Converter={StaticResource visConv}}"/>
            <ColumnDefinition Width="{Binding ElementName=tb2, Path=Visibility, Converter={StaticResource visConv}}"/>
        </Grid.ColumnDefinitions>
        <TextBox Grid.Column="0" Visibility="collapsed" Name="tb1" />
        <TextBox Grid.Column="1" Visibility="Visible"   Name="tb2" />
    </Grid>

最后转换器的代码是

[ValueConversion(typeof(System.Windows.Visibility), typeof(System.Windows.GridLength))]
public class VisibilityToColumnLengthConverter : IValueConverter
{
    public object  Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        System.Windows.Visibility vis = (System.Windows.Visibility)value;

        if (vis == System.Windows.Visibility.Visible)
            return new System.Windows.GridLength(1, System.Windows.GridUnitType.Star);
        else
            return new System.Windows.GridLength(1, System.Windows.GridUnitType.Auto);
    }

    public object  ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}