McTopaz

using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.IO;
using System.Linq;
using System.Management;
using System.Net;
using System.Net.Sockets;
using System.Net.Http.Headers;
using System.Text;

McTopaz

<Application x:Class="MaterialDesignTest.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:MaterialDesignTest"
             xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
             StartupUri="MainWindow.xaml">

    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>

McTopaz

<Window x:Class="WpfApp1.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:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">

    <Window.DataContext>

McTopaz

namespace My_WPF_Project
{
    public class Controller
    {
        vmHeader Vm { get; set; }
        
        public Controller(vmHeader vm)
        {
            Vm = vm;
            

McTopaz

<?xml version="1.0" encoding="utf-8" ?>
<Weavers>
  <PropertyChanged />
</Weavers>