InfoPath Dev

I am trying to use the View.SelectText method to set focus to a field on a View.  However, I keep getting an error:  "The specified values for the View.SelectText call are not valid."  Any ideas what I am doing wrong here?

 I have the following code:

XPathNavigator newNode = MainDataSource.CreateNavigator().SelectSingleNode(

                                        "/KPS:SYSTEMS/SYSTEM/BOOSTER/STAGE/PropellantMass/AttributeValue/Value/LowerValue",

                                        NameSpaceManager);

if (newNode != null) {

      CurrentView.SelectText(newNode, "CTRL1424");

}

The only thing I could think of would be if CTRL1424 wasn't in your current view - I'm sure you've checked that 100 times though. Oh, I guess you could also get that error if that control isn't bound to the field you are using for the XPathNavigator. I mean, your code looks just like the sample on the MSDN page for the method.