Вот пример, который показывает, что я имею в виду в своем последнем комментарии, основываясь на подсказках из вашего вопроса и комментария.Он показывает, как Visible, Hidden и Collapsed работают в StackPanel, в сетке с фиксированной высотой строки и в сетке с автоматической высотой строки.
Это довольно простой материал, но, надеюсь, он поможет вам,и любые будущие поиски Google.
<Window x:Class="CollapsedExample"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Collapsed Example" SizeToContent="WidthAndHeight">
<Window.Resources>
<Style x:Key="rectBase" TargetType="{x:Type Rectangle}">
<Setter Property="Width" Value="100" />
<Setter Property="Height" Value="50" />
<Setter Property="Margin" Value="5" />
<Setter Property="HorizontalAlignment" Value="Center" />
<Setter Property="VerticalAlignment" Value="Center" />
</Style>
<Style x:Key="rectCollapsing"
BasedOn="{StaticResource rectBase}"
TargetType="{x:Type Rectangle}">
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=radioVisible,
Path=IsChecked}"
Value="True">
<Setter Property="Visibility" Value="Visible" />
</DataTrigger>
<DataTrigger Binding="{Binding ElementName=radioHidden,
Path=IsChecked}"
Value="True">
<Setter Property="Visibility" Value="Hidden" />
</DataTrigger>
<DataTrigger Binding="{Binding ElementName=radioCollapsed,
Path=IsChecked}"
Value="True">
<Setter Property="Visibility" Value="Collapsed" />
</DataTrigger>
</Style.Triggers>
</Style>
<Style x:Key="labelStyle"
TargetType="{x:Type Label}">
<Setter Property="FontWeight" Value="Bold" />
<Setter Property="HorizontalAlignment" Value="Center" />
<Setter Property="VerticalAlignment" Value="Center" />
</Style>
</Window.Resources>
<Grid x:Name="gridLayout"
HorizontalAlignment="Center"
VerticalAlignment="Center">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<!-- Stack Panel -->
<Label Grid.Column="0"
Grid.Row="0"
Style="{StaticResource labelStyle}"
Content="Stack Panel" />
<StackPanel x:Name="stackExample"
Grid.Column="0"
Grid.Row="1">
<Rectangle Style="{StaticResource rectBase}"
Fill="Blue" />
<Rectangle Style="{StaticResource rectCollapsing}"
Fill="Red" />
<Rectangle Style="{StaticResource rectBase}"
Fill="Green" />
</StackPanel>
<!-- Grid with Fixed Sizes -->
<Rectangle x:Name="rectShading"
Grid.Column="1" Grid.Row="0" Grid.RowSpan="2"
Fill="LightGray" />
<Label Grid.Column="1"
Grid.Row="0"
Style="{StaticResource labelStyle}"
Content="Grid (Fixed Row Size)" />
<Grid x:Name="gridFixedRowsExample"
Grid.Column="1"
Grid.Row="1">
<Grid.RowDefinitions>
<RowDefinition Height="60" />
<RowDefinition Height="60" />
<RowDefinition Height="60" />
</Grid.RowDefinitions>
<Rectangle Style="{StaticResource rectBase}"
Grid.Row="0"
Fill="Blue" />
<Rectangle Style="{StaticResource rectCollapsing}"
Grid.Row="1"
Fill="Red" />
<Rectangle Style="{StaticResource rectBase}"
Grid.Row="2"
Fill="Green" />
</Grid>
<!-- Grid with Auto Sizes -->
<Label Grid.Column="2"
Grid.Row="0"
Style="{StaticResource labelStyle}"
Content="Grid (Auto Row Size)" />
<Grid x:Name="gridAutoRowsExample"
Grid.Column="2"
Grid.Row="1">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Rectangle Style="{StaticResource rectBase}"
Grid.Row="0"
Fill="Blue" />
<Rectangle Style="{StaticResource rectCollapsing}"
Grid.Row="1"
Fill="Red" />
<Rectangle Style="{StaticResource rectBase}"
Grid.Row="2"
Fill="Green" />
</Grid>
<!-- Options -->
<StackPanel x:Name="stackOptions"
Grid.Column="0" Grid.Row="2" Grid.ColumnSpan="3">
<RadioButton x:Name="radioVisibile"
IsChecked="True"
Margin="5"
Content="Red Rectangle is Visible" />
<RadioButton x:Name="radioHidden"
Margin="5"
Content="Red Rectangle is Hidden" />
<RadioButton x:Name="radioCollapsed"
Margin="5"
Content="Red Rectangle is Collapsed" />
</StackPanel>
</Grid>
</Window>