Getting a DCT to Refresh

I've got a java-callout that I'm asking my template developers to use in order to change the string captured by a browser tag.

Basically, I want to allow my content contributors to use the File Browser that interwoven provides to select some image and then click on a java-callout button I'm providing that will modify the String in the text field that is populated by the File Browser.

So I wrote this nice little java callout class and got it all working, except that when a user clicks on my java-callout button, the String in the text field on the DCT doesn't refresh! I know my callout is working, because if you save the info in the DCT into a DCR, close the templating wizard, and then open up that DCR, you'll see that the string has been converted to the correct value by the java-callout.

In the "IWDataCaptureShoutingCallout.java" that Interwoven provides as an example, they don't do anything fancy. . .they just use the "IWDataCaptureModifableLeaf.addValue()" method. I've tried that (and the .setValue() method), and nothing is causing my DCT to refresh. . .