WPF MVVM模式下如何将UI窗口变量传参到Viewmodel层

//窗口中绑定ViewModel
    &lt;hc:GlowWindow.DataContext&gt;
        &lt;viewmodel:MainWindowViewModel /&gt;
    &lt;/hc:GlowWindow.DataContext&gt;
  
//注册初始化事件
    <hc:Interaction.Triggers&gt;
        <hc:EventTrigger EventName="Loaded"&gt;
            <hc:EventToCommand Command="{Binding CmdLoaded}" PassEventArgsToCommand="True"/>
        </hc:EventTrigger>
    </hc:Interaction.Triggers>

//需要传递到viewmodel层的UI控件
    
                <Border
                    Grid.Column="1"
                    Margin="5"
                    Background="{DynamicResource MainContentForegroundDrawingBrush}">
                    <Grid x:Name="MainContent">
                      
                    </Grid>
                </Border>
                
//需要传递到viewmodel层的UI控件                
                <hc:Drawer
                    Name="DrawerSourceCode"
                    Dock="Right"
                    MaskCanClose="True"
                    ShowMode="Push">
                    <hc:ScrollViewer Width="700">
                        <avalonEdit:TextEditor
                            Name="TextContainer"
                            Margin="5"
                            FontFamily="Consolas"
                            FontSize="10pt"
                            IsReadOnly="True"
                            ShowLineNumbers="True"
                            SyntaxHighlighting="C#" />
                    </hc:ScrollViewer>
                </hc:Drawer>

viewMod el层

        // 控件
        private Grid MainContent;
        private TextEditor TextContainer;
        
         /// <summary>
        /// 关联控件 通过Lazy关键字 实现延迟初始化
        /// </summary>
        public RelayCommand<RoutedEventArgs> CmdLoaded => new Lazy<RelayCommand<RoutedEventArgs>>(() => new RelayCommand<RoutedEventArgs>(Loaded)).Value;
        private void Loaded(RoutedEventArgs e)
        {
            MainContent = (e.Source as MainWindow).MainContent;
            TextContainer = (e.Source as MainWindow).TextContainer;
        }