How to restrict resizing of the docking child width in WPF DockingManager?

<Window x:Class="DockingManager_147867.MainWindow"
                xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                xmlns:syncfusion="http://schemas.syncfusion.com/wpf"
                Title="MainWindow" Height="350" Width="525">
     <Grid x:Name="Grid1">
          <syncfusion:DockingManager x:Name="DockingManager1" UseDocumentContainer="True" >
              <ContentControl x:Name="Content1" syncfusion:DockingManager.State="Dock" syncfusion:DockingManager.Header="Child1"  syncfusion:DockingManager.CanResizeWidthInDockedState="False"/>
               <ContentControl x:Name="Content2" syncfusion:DockingManager.State="Document" syncfusion:DockingManager.Header="Child2"/>
               <ContentControl x:Name="Content3" syncfusion:DockingManager.State="Dock" syncfusion:DockingManager.Header="Child3"/>
           </syncfusion:DockingManager>    
      </Grid>
</Window>

using Syncfusion.Windows.Tools.Controls;
namespace DockingManager_147867
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            DockingManager dock = new DockingManager();
            dock.UseDocumentContainer = true;
            ContentControl content1 = new ContentControl();
            DockingManager.SetHeader(content1, "Child1");
            DockingManager.SetState(content1, DockState.Dock);
            DockingManager.SetCanResizeWidthInDockedState(content1, false);
            ContentControl content2 = new ContentControl();
            DockingManager.SetHeader(content2, "Child2");
            DockingManager.SetState(content2, DockState.Document);
            ContentControl content3 = new ContentControl();
            DockingManager.SetHeader(content3, "Child3");
            DockingManager.SetState(content3, DockState.Dock);
            dock.Children.Add(content1);
            dock.Children.Add(content2);
            dock.Children.Add(content3);
            Grid1.Children.Add(dock);
        }
    }
}