DataContext to UserControl

Question

Please tell me how to set something like "DataContextType" in UserControl.

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In my case I have MainWindow.xaml with TabControl, where I set two TabItems. They have UserControl type.

<Window x:Class="MyProject.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:MyProject"
        xmlns:views="clr-namespace:MyProject.Views"
        mc:Ignorable="d"
        Title="MainWindow" Height="600" Width="1080">
    <Grid>
        <TabControl>
            <TabItem Header="Item 1" Width="auto" >
                <views:ViewContol1 DataContext="{Binding ViewContol1ViewModel}"></views:ViewContol1>
            </TabItem>
            <TabItem Header="Item 2" Width="auto" >
                <views:ViewContol2 DataContext="{Binding ViewContol2ViewModel}"></views:ViewContol2>
            </TabItem>
        </TabControl>
    </Grid>
</Window>

DataContext for my MainWindow.xaml is MainViewModel.cs class instance. I setting it in MainWindow.xaml.cs. It has two "View Model" properties for each TabItem.

using Prism.Mvvm;
using System.Text;

namespace MyProject.ViewModels
{
    public class MainViewModel : BindableBase
    {
        public ViewContol1ViewModel ViewContol1ViewModel { get; set; }
        public ViewContol2ViewModel ViewContol2ViewModel { get; set; }
        public MainViewModel()
        {
            ViewContol1ViewModel = new ViewContol1ViewModel();
            ViewContol2ViewModel = new ViewContol2ViewModel();
        }
    }
}

And it is UserControl1.xaml, where I setting DataContext second time to be able to see it's ViewModel's (ViewContol1ViewModel type instance) variables in XAML editor.

<UserControl x:Class="MyProject.Views.ViewContol1"
            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" 
            xmlns:local="clr-namespace:MyProject.Views"
            xmlns:viewmodels="clr-namespace:MyProject.ViewModels"
            mc:Ignorable="d" 
            d:DesignHeight="450" d:DesignWidth="800">
    <UserControl.DataContext>
        <viewmodels:ViewContol1ViewModel></viewmodels:ViewContol1ViewModel>
    </UserControl.DataContext>
    <Grid>
    </Grid>
</UserControl>

My solution makes two instance of ViewContol1ViewModel class. First when initializes UserControl and second when I set it's DataContext in my MainWindow.
So I want to know if it's possible to set type of User Control's DataContext type to certain class type, to see properties of DataContext to which I want to bind my View elements in UserControl.

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I used DesignInstance, but VS doesn't want to compile my project.
Screen1
It said like there is no this class in namespace but it actually is, an VS it shows:
Screen2