Can not bind View to ViewModel - wpf

Question

I'm trying to do a simplest thing: bind a View to ViewModel, but for some reason it doesn't work.
I've got MainWindow:
<Window x:Class="ImagesToAmazon.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
xmlns:v="clr-namespace:ImagesToAmazon.View"
xmlns:vm="clr-namespace:ImagesToAmazon.ViewModel" >
<Window.Resources>
<DataTemplate DataType="{x:Type vm:MainViewModel}">
<v:MainControl />
</DataTemplate>
</Window.Resources>
<Grid>
</Grid>
MainViewModel:
namespace ImagesToAmazon.ViewModel{
public class MainViewModel {
}}
MainControl:
<UserControl x:Class="ImagesToAmazon.View.MainControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<StackPanel>
<Button Content="Button" Height="23" Name="button1" Width="75" />
</StackPanel>
Also, I override App.OnStartup to set MainWindow context:
public partial class App : Application
{
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
var window = new MainWindow();
var viewModel = new ViewModel.MainViewModel();
window.DataContext = viewModel;
window.Show();
}
}
All compiles, but I don't see my button from MainControl.
Any clues?

Answer 1

In the main window, replace the Grid with
<ContentControl Content="{Binding }" />
This will attempt to use the current DataContext as the content of the control, and it will use the DataTemplate u defined earlier.