Building a word document in vb.net - Ability to format the header jpg.

With the code below I am able to add the jpg file to the word document header but I am unable to modify.  I need the ability to format the picture to Horizontal Alignment = Left and wrapping style = Behind Text, and adjust the size of the photo to include the entire width of the document.

oWord.ActiveWindow.ActivePane.View.SeekView = Word.WdSeekView.wdSeekCurrentPageHeader

 oWord.ActiveWindow.Selection.InlineShapes.AddPicture(FileName:="G:\apps\EXECSRCH\header.jpg", LinkToFile:=False, SaveWithDocument:=True)

Any help would be greatly appreciated.

Thank you,
Vince