ExpanderView not showing controls inside it - xaml

Question

In the below XAML, I am able to see the controls inside the expanderview on expanding which is on GridRow 6 but not able to see any controls inside the expanderview which is on GridRow 0. Can anyone help me as to what am I missing here?
<Grid x:Name="ContentPanel" Margin="0,50,0,1" Background="White">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" MinHeight="0"></RowDefinition>
<RowDefinition Height="Auto" MinHeight="0"></RowDefinition>
<RowDefinition Height="Auto" MinHeight="0"></RowDefinition>
<RowDefinition Height="Auto" MinHeight="0"></RowDefinition>
<RowDefinition Height="Auto" MinHeight="0"></RowDefinition>
<RowDefinition Height="Auto" MinHeight="0"></RowDefinition>
<RowDefinition Height="Auto" MinHeight="0"></RowDefinition>
<RowDefinition Height="Auto" MinHeight="0"></RowDefinition>
</Grid.RowDefinitions>
<StackPanel Grid.Row="0" Orientation="Vertical" VerticalAlignment="Top">
<StackPanel Orientation="Horizontal" VerticalAlignment="Top">
<Image x:Name="img1" VerticalAlignment="Top" Height="40" Width="40" HorizontalAlignment="Left" Margin="10,92,0,0" Source="Images/1.png" Visibility="Collapsed" Canvas.ZIndex="3"></Image>
<TextBlock x:Name="tbScore" VerticalAlignment="Top" HorizontalAlignment="Left" Foreground="White" Width="Auto" Margin="-32,97,0,0" FontFamily="TypeFace" FontSize="18" Canvas.ZIndex="3"/>
<Image x:Name="img1" Height="90" Margin="-23,20,0,0" VerticalAlignment="Top" HorizontalAlignment="Left" Width="90"/>
<StackPanel Orientation="Vertical">
<TextBlock x:Name="tb1" VerticalAlignment="Top" HorizontalAlignment="Left" Foreground="Black" Width="Auto" Margin="27,20,0,0" FontWeight="SemiBold" FontFamily="Georgia" FontSize="22" Tap="tbUserName_Tap"/>
<TextBlock x:Name="tb2" VerticalAlignment="Top" Foreground="#FF747171" HorizontalAlignment="Left" Margin="27,10,0,0" FontFamily="Georgia" FontSize="20" Tap="tbScreenName_Tap"/>
</StackPanel>
</StackPanel>
<toolkit:ExpanderView x:Name="evMoreDetails" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="10,10,0,0" Collapsed="evMoreDetails_Collapsed" Header="V " Foreground="Black" FontSize="26" Expanded="evMoreDetails_Expanded">
<toolkit:ExpanderView.Items>
<StackPanel Orientation="Vertical" VerticalAlignment="Top">
<TextBlock Width="Auto" x:Name="Name" VerticalAlignment="Top" FontFamily="Segoe UI" TextWrapping="Wrap" Margin="10,8,0,0" FontSize="22" FontWeight="SemiBold" Foreground="Black" Text="{Binding name}" />
<TextBlock Width="Auto" x:Name="Name1" VerticalAlignment="Top" Margin="8,2,0,0" FontFamily="Segoe UI" TextWrapping="Wrap" FontSize="20" Foreground="Black" Text="{Binding name1}" />
</StackPanel>
</toolkit:ExpanderView.Items>
</toolkit:ExpanderView>
</StackPanel>
<StackPanel Grid.Row="6" Orientation="Vertical" HorizontalAlignment="Left" VerticalAlignment="Top">
<toolkit:ExpanderView x:Name="evMore" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="10,20,0,50" Visibility="Collapsed">
<toolkit:ExpanderView.HeaderTemplate>
<DataTemplate>
<Grid HorizontalAlignment="Left" >
<TextBlock Text="+ more" FontSize="26" Foreground="Black">
</TextBlock>
</Grid>
</DataTemplate>
</toolkit:ExpanderView.HeaderTemplate>
<toolkit:ExpanderView.Items>
<ListBox x:Name="lb" Height="250" HorizontalAlignment="Left">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" VerticalAlignment="Top" HorizontalAlignment="Left" Width="{Binding Width}">
<Image x:Name="ProfilePic" Width="80" Height="80" Source="{Binding image}" VerticalAlignment="Top" Margin="0,10,0,0" />
<StackPanel Orientation="Vertical" VerticalAlignment="Top" HorizontalAlignment="Left" Width="{Binding Width}">
<StackPanel Orientation="Vertical" VerticalAlignment="Top">
<TextBlock Width="Auto" x:Name="Name" VerticalAlignment="Top" FontFamily="Segoe UI" TextWrapping="Wrap" Margin="10,8,0,0" FontSize="22" FontWeight="SemiBold" Foreground="Black" Text="{Binding name}" />
<TextBlock Width="Auto" x:Name="Name1" VerticalAlignment="Top" Margin="8,2,0,0" FontFamily="Segoe UI" TextWrapping="Wrap" FontSize="20" Foreground="Black" Text="{Binding name1}" />
</StackPanel>
</StackPanel>
<StackPanel Orientation="Vertical" VerticalAlignment="Top">
<CheckBox x:Name="chkSelect" IsChecked="{Binding isprim}" Foreground="Black" Tag="{Binding id}" HorizontalAlignment="Right" BorderBrush="Black" BorderThickness="0.5" Margin="0,0,0,0" />
</StackPanel>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</toolkit:ExpanderView.Items>
</toolkit:ExpanderView>
</StackPanel>
</Grid>

Answer 1

I also have same problem in past. Please specify some height for expander item, in your case give some height to stackpanel at row 0.