How to determine when a docking window is transitioned on an MDIChild form others in WinForms Docking Manager?

foreach (Control ctrl in this.Controls)
{
   if (ctrl.GetType() == typeof(MdiClient))
   {
       ctrl.ControlAdded += new ControlEventHandler(this.MDIClient_ControlAdded);
       ctrl.ControlRemoved += new ControlEventHandler(this.MDIClient_ControlRemoved);
       break;
   }
}
protected void MDIClient_ControlAdded(object sender, ControlEventArgs e)
{
   if (e.Control is Syncfusion.Windows.Forms.Tools.DockingWrapperForm)
   {
       Console.WriteLine("Docking window to MDIChild transition");
   }
}
protected void MDIClient_ControlRemoved(object sender, ControlEventArgs e)
{
   if (e.Control is Syncfusion.Windows.Forms.Tools.DockingWrapperForm)
   {
       Console.WriteLine("MDIChild to Docking window transition");
   }
}

For Each ctrl As Control In Me.Controls
    If ctrl.GetType() Is GetType(MdiClient) Then
       AddHandler ctrl.ControlAdded, AddressOf MDIClient_ControlAdded
       AddHandler ctrl.ControlRemoved, AddressOf MDIClient_ControlRemoved
    Exit For
End If
Next ctrl
Protected Sub MDIClient_ControlAdded(ByVal sender As Object, ByVal e As ControlEventArgs)
    If TypeOf e.Control Is Syncfusion.Windows.Forms.Tools.DockingWrapperForm Then
       Console.WriteLine("Docking window to MDIChild transition")
    End If
End Sub
Protected Sub MDIClient_ControlRemoved(ByVal sender As Object, ByVal e As ControlEventArgs)
    If TypeOf e.Control Is Syncfusion.Windows.Forms.Tools.DockingWrapperForm Then
       Console.WriteLine("MDIChild to Docking window transition")
    End If
End Sub