Paste to navigation search box from userform

[JPG]

I am using a form in a VBA macro in Word.

In Word 2010 there is a navigation pane.
At the top you can type something to search.

I want to paste data I have in the clipboard to that navigation pane search box.
I can't seem to activate that navigation search box with what I have tried.

So my form lists out the result of a regex search into a textbox. I triple click to select the line I want to now locate in the Word document and press a button on my form.
The msgbox shows with the correct data, so that is good so far.
It is just the next step that I need. (I have commented out the SendKeys part). How to select that search box and then I can use the SendKeys part of the code.

Private Sub CommandButton48CopyTextInTextbox_Click()
    TextBox8refList.SetFocus
    TextBox8refList.Copy
    Dim DataObj As MSForms.DataObject
    Set DataObj = New MSForms.DataObject
    DataObj.GetFromClipboard
    strPaste = DataObj.GetText(1)
    ActiveWindow.DocumentMap = True
    ActiveWindow.SetFocus
    ActiveDocument.Activate
    'SendKeys "^(f){backspace}^{v}{Enter}"
    MsgBox (strPaste)
End Sub

thanks in advance for any assistance.
Jon