first edit

XLIMS.DEV/Views/DeviceView.xaml

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+<UserControl x:Class="XLIMS.DEV.Views.DeviceView"
+             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:XLIMS.DEV.Views"
+             mc:Ignorable="d" 
+             d:DesignHeight="450" d:DesignWidth="800">
+    <Grid>
+            
+    </Grid>
+</UserControl>

XLIMS.DEV/Views/DeviceView.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace XLIMS.DEV.Views
+{
+    /// <summary>
+    /// Логика взаимодействия для DeviceView.xaml
+    /// </summary>
+    public partial class DeviceView : UserControl
+    {
+        public DeviceView()
+        {
+            InitializeComponent();
+        }
+    }
+}

XLIMS.DEV/Views/MainView.xaml

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+<UserControl x:Class="XLIMS.DEV.Views.MainView"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             >
+    <Grid>
+        <TextBlock Text="{Binding Title}"/>
+    </Grid>
+</UserControl>

XLIMS.DEV/Views/MainView.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace XLIMS.DEV.Views
+{
+    /// <summary>
+    /// Логика взаимодействия для MainView.xaml
+    /// </summary>
+    public partial class MainView : UserControl
+    {
+        public MainView()
+        {
+            InitializeComponent();
+        }
+    }
+}