Displaying a Modal from Workspace Extension

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Hi all,

I'm working on a workspace extension that would take some data the user enters into the Incident workspace, then on button click, the extension would get the data the user entered, make a web service call to validate that data and display the validated data in a modal or other window. The user would then be able to select the validated data to have it populated back into the workspace fields. 

Looking through the developer guide I see that UI extensions have a modal window object that can be used to render a new modal window, but don't see anything similar for workspace extensions. Is it possible to display a pop up modal or window from a workspace extension?