Can ViewModel have multiple instances?

I have a “SideView” and a “SideViewModel”. I want to show it twice in “MainView”, But it can not work. It just show “DownSideView”. Code in MainView.xaml

<Grid>
  <Grid.RowDefinitions>
    <RowDefinition Height="1*"/>
    <RowDefinition Height="1*"/>
  </Grid.RowDefinitions>
  <Grid Grid.Row="0">
    <ContentControl x:Name="UpSideView" HorizontalAlignment="Center" VerticalAlignment="Center"/>
  </Grid>
  <Grid Grid.Row="1">
    <ContentControl x:Name="DownSideView" HorizontalAlignment="Center" VerticalAlignment="Center"/>
  </Grid>
</Grid>

Code in MainViewModel.cs

[Import(typeof(SideViewModel), AllowDefault = true)]
public SideViewModel UpSideView { get; set; }

[Import(typeof(SideViewModel), AllowDefault = true)]
public SideViewModel DownSideView { get; set; }

[seba30]

If you decorate your ViewModel with

[Export]
[PartCreationPolicy(CreationPolicy.NonShared)]

then on every injection a new instance will be generated.

[mvermef]

The di appears to be MEF or a derivative