ListView groupby and also preserve original items - wpf

Question

I have a viewmodel in my wpf application like this:
Students = new ObservableCollection<Student>(); //main list
Students.Add(new Student_Senior { Name = "GG", Age = 14 });
Students.Add(new Student_Senior { Name = "VV", Age = 20 , IsGenius = true});
Students.Add(new Student_Senior { Name = "YY", Age = 23 });
Students.Add(new Student_Senior { Name = "BB", Age = 18 });
Students.Add(new Student_Senior { Name = "CC", Age = 11, IsGenius = true });
Students.Add(new Student_Senior { Name = "WW", Age = 20 });
I would like to display my listbox in output ui like this (based on IsGenius = true):
-----------------------------
Genius: True
VV 20 true
CC 11 true
All:
GG 14 false
VV 20 true
YY 23 false
BB 18 false
CC 11 true
WW 20 false
------------------------------
i tried doing this:
<CollectionViewSource x:Key="StudentGroup" Source="{Binding Path=Students}">
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="IsGenius" />
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
<ListView DataContext="{StaticResource StudentGroup}">
<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Margin" Value="0,0,0,5"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type GroupItem}">
<Expander IsExpanded="True">
<Expander.Header>
<DockPanel>
<TextBlock FontWeight="Bold" Text="{Binding Path=Name}"/>
</DockPanel>
</Expander.Header>
<Expander.Content>
<ItemsPresenter />
</Expander.Content>
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
</ListView.GroupStyle>
But this groups it based on IsGenius=true and IsGenius=false as two distinct groups. I want to preserve the original (full) rows below the IsGenius = true group.
Has anyone tried this before!.. please let me know. Thanks a lot.