final void removeOverlay(Region overlay, GlassPane glassPane) {
    LOGGER.trace("removeOverlay");
    glassPane.hideProperty().unbind();
    getChildren().removeAll(glassPane, overlay);
  }
Removes the {@code overlay} from the scene graph and removes the bindings created with the call
to {@link WorkbenchView#addOverlay(Region, GlassPane)}.

@param overlay   to be removed from the scene graph
@param glassPane the {@code overlay}'s corresponding {@link GlassPane}
workbenchfx-core/src/main/java/com/dlsc/workbenchfx/view/WorkbenchView.java