I'm trying to find a way to make a span of text in the RadRichTextBox blink. There's no easy way to toggle this like with Bold, Italics, etc. I don't even know if it's possible to set a Span as the target of a Storyboard and use a DoubleAnimation on the Opacity property like I could do with a TextBlock. Even if that is possible, how can I determine which Spans are in the current selection, and if I need to create new Spans (like the ToggleBold function does when the bold starts/ends in the middle of an existing span). Any suggestions?