I've been developing a WPF ribbon application using the controls in the System.Windows.Controls.Ribbon namespace. The more I use this, the more I find features missing here and there when compared with other ribbons like the ones from Microsoft Office. One small feature the "prompt" or watermark-type text shown in a ComboBox/Textbox when there is no content (ie. when the Text is blank or when there is no selected item).
Is there any clean way to implement this in the Ribbon controls?