Open a Word documnet with all the formatting marks visible

Question

I am building a Word custom Ribbon as a VSTO project using VB within the Visual Studio environment.
Part of what I want to do is, from the Ribbon, open Word documents:

• with all the formatting marks visible
• the Styles pane visible .

I have done this previously with VBA as each document is opens using the following:

'Open Word with Styles pane visible and docked to the right
    With Application
        .TaskPanes(wdTaskPaneFormatting).Visible = True
        .CommandBars("Styles").Position = msoBarRight
    End With
    ActiveWindow.DocumentMap = True

'Open document with all formatting and hidden text visible
    ActiveWindow.View.ShowAll = True

I've been searching for hours and cannot find how to do this with VB.net.

Is anybody able to help please.