Is TextTrimming= "WordEllipsis" Supported in WP7 or Not?

I'm t开发者_如何学编程rying to suffix an ellipsis when the contents in the textbox is too long, but I can't find a "TextTrimming" property in the WP7 framework. Is there some other property to perform the same function? For example:

"If the sentence is too big, I want it to end with a ..."

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Robby Ingebretsen's TextTrimming TextBlock for Silverlight works well in WP7.

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The TextTrimming property of the TextBlock is supported in the Mango version of the SDK.