MVVM issue with View not creating an instance but view not displaying

public MainWindowViewModel()
{
       MakeViewModel mMakeViewModel = new MakeViewModel();
       this.ViewModels .Add(mMakeViewModel);
}

<Window......
    <Window.Resources>
        <DataTemplate DataType="{x:Type vm:MakeViewModel}">
            <vw:MakeControl/>
        </DataTemplate>
    </Window.Resources>
    <Grid>
        <Border >
            <ContentControl Content="{Binding ViewModels}" />
        </Border>
    </Grid>
<Window/>

base.OnStartup(e);
CallWindow mCallWindow = new CallWindow();
var mViewModel = new MainWindowViewModel();
mCallWindow.DataContext = mViewModel ;
mCallWindow.Show();