如何使用高度=自动访问元素的实际高度

I have a situation like this:

我有这样的情况:

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="560"/>
        <ColumnDefinition Width="250"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" /> <!-- status infos & content start -->
        <RowDefinition Height="Auto" /> <!-- status infos -->
        <RowDefinition Height="Auto" /> <!-- status infos -->
        <RowDefinition Height="Auto" /> <!-- status infos -->
        <RowDefinition Height="*"/>     <!-- content ends -->
    </Grid.RowDefinitions>

    <!-- image a list of custom controls directed to the first or second column on all rows here -->

    <SomeCustomControl Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2" Grid.RowSpan="2" />
</Grid>
<Gri