Missing user defined context menu in WebBrowser Control

I faced with a problem while i was tring to assign a context menu in WebBrowser control.
Before using navigate method of the control,
I was able to see my own custom context menu by right clicking on it.
But I was not able to see my own context menu after using navigate method and Internet Explore was putting its own context menu.
I add context menu to my application by using this code below

public Form1()
        {
          InitializeComponent();
            ContextMenuStrip myContextMenuStrip = new  System.Windows.Forms.ContextMenuStrip();
            myContextMenuStrip.Items.Add("m1", null, myContextMenuItem_Click);
            myContextMenuStrip.Items.Add("m2", null, myContextMenuItem_Click);
            myContextMenuStrip.Items.Add("m3", null, myContextMenuItem_Click);
            myContextMenuStrip.Items.Add("m4", null, myContextMenuItem_Click);
            myContextMenuStrip.Items.Add("m5", null, myContextMenuItem_Click);
            webBrowser1.ContextMenuStrip = myContextMenuStrip;      
        }

I was sure that there is something missing which is using

    webBrowser1.IsWebBrowserContextMenuEnabled = false;


public Form1()
        {
            InitializeComponent();
            ContextMenuStrip myContextMenuStrip = new System.Windows.Forms.ContextMenuStrip();
            myContextMenuStrip.Items.Add("m1", null, myContextMenuItem_Click);
            myContextMenuStrip.Items.Add("m2", null, myContextMenuItem_Click);
            myContextMenuStrip.Items.Add("m3", null, myContextMenuItem_Click);
            myContextMenuStrip.Items.Add("m4", null, myContextMenuItem_Click);
            myContextMenuStrip.Items.Add("m5", null, myContextMenuItem_Click);
            webBrowser1.ContextMenuStrip = myContextMenuStrip;
           
            webBrowser1.IsWebBrowserContextMenuEnabled = false;
        }

It was okey and I was just able to see my own context menu :)