Is it possible to use FillBetweenItem to fill between two PlotCurveItem's in pyqtgraph?

Question

I'm attempting to fill between two curves that were created using PlotCurveItem in pyqtgraph.

            phigh = self.p2.addItem(pg.PlotCurveItem(x, y, pen = 'k'))           
            plow = self.p2.addItem(pg.PlotCurveItem(x, yy, pen = 'k'))           
            pfill = pg.FillBetweenItem(phigh, plow, brush = br)
            self.p2.addItem(pfill)

The curve items are plotting properly however there is no fill.

Answer 1

This fixed it.

            phigh = pg.PlotCurveItem(x, y, pen = 'k')           
            plow = pg.PlotCurveItem(x, yy, pen = 'k')                  
            pfill = pg.FillBetweenItem(ph, plow, brush = br)
            self.p2.addItem(ph)
            self.p2.addItem(plow)
            self.p2.addItem(pfill)