DygraphOps.dispatchMouseDown_Point(g, 100, 100, {shiftKey: true});
DygraphOps.dispatchMouseMove_Point(g, 200, 100, {shiftKey: true});
DygraphOps.dispatchMouseUp_Point(g, 200, 100, {shiftKey: true});
DygraphOps.dispatchMouseDown_Point(g, 100, 100, {shiftKey: true});
DygraphOps.dispatchMouseMove_Point(g, 200, 100, {shiftKey: true});
DygraphOps.dispatchMouseUp_Point(g, 200, 100, {shiftKey: true});