Right click on a LabVIEW class control, indicator, constant or FPTerminal (including array terminal). Adds a menu item for "Change LabVIEW Class..." which brings up a dialog to allow you to select a different class to replace the current one. The replace does NOT ever presserve data -- if you change from a child class to a parent class, the new control/constant will have the default and operate values of the parent class.
Attachement is saved in LabVIEW 2015. For install instructions, go here.