RotoPaint - Nuke 101: Professional Compositing and Visual Effects - page 291

Each of these strokes has keyframes associated with it—in your case, keyframes
fortheactualshapethatwasdrawnandtwokeyframesfortheWriteOnEndprop-
erty you animated.
12. Click the little + symbol to the left of the Brush1 property ( FIGURE 6.69 ).
Figure 6.69. This shows the two properties that Brush1 has keyframes in.
I really only want to stagger the Write On End property. If I move the stroke's
drawing keyframe it won't have any effect on the animation or the shape. As it's
easier to move both of them as one entity that's what you will do.
13. Click the − symbol to the left of the Brush1 property.