try fix listbox, datagrid foreground bug (win xp)
set Fg for row too
try setting TextElement.Foreground
setting TextElement.Foreground not necessary
introduce style for RichTextBox
metro style for ContextMenu in TextBox controls
Merge pull request #771 from MahApps/769-770-listbox-datagrid-foreground-bugs

listbox, datagrid, richtextbox foreground with win xp