Keyframes of animated Child gameobject not shown by parent gameobjects animator issue ?

In below image, you see I have selected Cube gameobject. It's keyframe is shown in animation tab. Actually, i have animated sphere(child gameobjct) as well whose keyframes are not shown .

In img below, i have selected sphere now, whose keyframes are seen. These keyframes should have been seen when I select Cube as well. But , it's not showing . Any idea why ? plz help !!