我有一个GridView，它有两个XAML中的静态宽度列。但第二列躲在窗外时，窗口缩小。如何使第二列下移动的第一列，而不是隐藏它的窗口？谢谢.

<Grid Background="White">
    <Grid.ColumnDefinitions>
        <ColumnDefinition/>
        <ColumnDefinition/>
    </Grid.ColumnDefinitions>
    <!-- first column-->
    <Grid Grid.Column="0">
        <ScrollViewer>   
            <StackPanel Orientation="Vertical">
               <!-- listview -->
            </StackPanel>
        </ScrollViewer>
    </Grid>
    <!-- second column -->
    <Grid Grid.Column="1">
        <ScrollViewer>
            <StackPanel Orientation="Vertical" Margin="5,10,0,0">
                <!-- listview -->
            </StackPanel>
        </ScrollViewer>
    </Grid>
</Grid>

更新：添加源代码