Open New Window In Current Web Browser Control With Submitted Data

Question

In my Project, i am using a web browser control. I also able to handle new window in same browser control using the help from follow so answer:

SO Answer To Open New Window In Same Webbrowser Control

But the issue i am facing is, if i submit a form that open in new window that don't work.

I have noticed that SHDocVw Newwindow event has PostData (as Object) parameter but webbrowser control need PostData as bytearray.

SHDocVw Newwindow event parameters:

(URL As String, Flags As Integer, TargetFrameName As String, ByRef PostData As Object, Headers As String, ByRef Processed As Boolean)

Webbrowser control navigate parameters:

(string source, string targetFrameName, byte[] postData, string additionalHeaders);

As Asked Here is My Code: (But as it is same as the mentioned SO answer, I don't think it would be any help)

Private Sub Web_V1_NewWindow(URL As String, Flags As Integer, TargetFrameName As String, ByRef PostData As Object, Headers As String, ByRef Processed As Boolean) Handles Web_V1.NewWindow
        Processed = True
        webMain.Navigate(URL)
End Sub

So, my question is how can i convert that postdata object to bytearray so that webbrowser control can handle the submitted form/data correctly?