Highlighting text in Outlook 'CC:' box

[ModusOperandi]

I'm fairly new to all this so please bear with me.
My vba application creates an e-mail at the end using the Outlook object.
This works fine, however I've trying to think of way to highlight text in the 'CC:' box when the e-mail opens so that the user will manually enter an address there.
Here's my code snippet at present:

Private Sub CommandButton1_Click()
    Set myOlapp = CreateObject("Outlook.Application")
    Set myitem = myOlapp.CreateItem(olMailItem)
    Set myattachments = myitem.Attachments
    Set myRecipientAdmin = myitem.Recipients.Add("ADD_OTHER_PEOPLE_HERE")
    myRecipientAdmin.Type = olCC
    Set myRecipientMain = myitem.Recipients.Add("Mr Brown;Mr Black;Mr White")
    myRecipientMain.Type = olTo
    myattachments.Add CorrectFileNameandPath, olByValue, 1
    myitem.Subject = ReportFileName
    myitem.Display
    Me.Hide
    FinishOff.Show
End Sub

I want the text 'ADD_OTHER_PEOPLE_HERE' highlighted so it stands out.

Any ideas ?