Animating a GameObject using a GUIEditor does not record keyframes. I want to animate a GameObject using the new Timeline feature (in Unity 2017.2). I have added the GameObject to the Timeline. I press the GameObject track's record button. I manipulate the GameObject's attributes directly. Keyframes are added. It works great! To simplify the work-flow I have written a GUIEditor that contains sliders controlling just the attributes I want to animate. When I drag the sliders, the attributes of the GameObject change accordingly. All good! The problem: Even though the GameObject's attributes update, keyframes are not recorded in the Timeline. Is there a way to force the Timeline to update and add keyframes to any attributes that have changed?