Cefsharp .NET -> JS method execution

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VB

Javascript

Hi,

I'm able to execute a method in my VB.NET program from within the ChromiumWebBrowser with the following code;

Public Class Main

Private WithEvents browser As New ChromiumWebBrowser(IO.Path.GetFullPath("Webpage/index.html")) With {.Dock = DockStyle.Fill}
    Private messageReceiver As New MessageReceiver(browser)

    Private Sub Main_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Controls.Add(browser)
        CefSharpSettings.LegacyJavascriptBindingEnabled = True
        browser.RegisterJsObject("messageReceiver", messageReceiver)
    End Sub
End Class

Public Class MessageReceiver

    Private browser As ChromiumWebBrowser

    Public Sub New(ByRef browser As ChromiumWebBrowser)
        Me.browser = browser
    End Sub

    Public Sub browserToProgram(msg As String)
        ' MsgBox(msg,, "browserToProgram")
    End Sub

    Public Sub send(msg As String)
        browser.ExecuteScriptAsync("alert(" & msg & ")") ' would normally be programToBrowser(msg)
    End Sub

End Class

function browserToProgram(msg)
{
	(async function()
	{
		await CefSharp.BindObjectAsync('messageReceiver', 'bound');
		messageReceiver.browserToProgram(msg);
	})();
}

However, I can't get it working the other way;

Private Sub browser_IsBrowserInitializedChanged(sender As Object, e As IsBrowserInitializedChangedEventArgs) Handles browser.IsBrowserInitializedChanged
        If e.IsBrowserInitialized Then
            Timer1.Start()
        End If
    End Sub

    Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
        messageReceiver.send("Test from VB.NET")
    End Sub

function programToBrowser(msg)
{
	alert(msg);
}

So the VB.NET program displays a messagebox (if I uncomment that line) when the JS calls browserToProgram(x), but nothing displays on the webpage when VB.NET calls programToBrowser(x).

What I have tried:

Commenting out .NET-side messageboxes to try to prevent timing issues with threadblocking

Instead of calling the JS method, simply calling 'alert(x)' to eliminate potential issues with user-defined methods