WPF UserControl instead of Window in ViewModel - wpf

Question

How can I change xaml of MenuManagement from Window to UserControl?
I want to use MenuManagement inside MainWindow xaml lik this:
this.mainViewModel = new MainWindow();
this.mainViewModel.Show();
this.mainViewModel.LayoutMain.Navigate(new MenuManagement());
but I receive error:
"Additional information: '***.Views.MenuManagement' root element is not valid for navigation."
My MenuViewModel:
class MenuViewModel : ViewModelBase<IMainView>
{
public MenuViewModel()
:base(new MenuManagement())
{ //...
}}
xaml of MenuManagment
<Window x:Class="***.Views.MenuManagement"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
Title="MenuManagement" Height="720" Width="1280">
<Grid>
...
</Grid>
MenuManagement
public partial class MenuManagement : Window, IMainView
{
public MenuManagement()
{
InitializeComponent();
} }
EDIT:
Interface
public interface IView
{
object DataContext { get; set; }
void Close();
}
public interface IMainView : IView
{
void Show();
}
}

Answer 1

Change this:
<Window x:Class="***.Views.MenuManagement"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
Title="MenuManagement" Height="720" Width="1280">
<Grid>
...
</Grid>
to:
<UserControl x:Class="***.Views.MenuManagement"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
Title="MenuManagement" Height="720" Width="1280">
<Grid>
...
</Grid>
</UserControl>
and this:
public partial class MenuManagement : Window, IMainView
{
public MenuManagement()
{
InitializeComponent();
}
}
to:
public partial class MenuManagement : UserControl, IMainView
{
public MenuManagement()
{
InitializeComponent();
}
}