private void toggleDisplay(LocalDisplay dpy, boolean showFirstGIF) { java.util.Vector v = dpy.getRenderers(); final int size = v.size(); if (size != 2) { System.err.println("Expected 2 DataRenderers, but Display has " + size); return; } ((DataRenderer) v.get(0)).toggle(showFirstGIF); ((DataRenderer) v.get(1)).toggle(!showFirstGIF); }