layer Right Blink. 6. Select frame 100 on the Left Blink layer, and then press Shift and select frame 100 on the Right Arm layer to select frame 100 for all the layers. 7. Press F5 to extend each layer to frame 100. [View full size image] Animating Nested Symbols The alien symbol contains several nested symbols, including the arm symbols. You'll use motion tweens to animate the arms so that they move up and down. 1. Select frame 100 on both the Left Arm and Right Arm layers, and press F6 to insert a keyframe for each. 2. Select frame 50 on both the Left Arm and Right Arm layers, and press F6 to insert a keyframe for each. 3. Select any frame between frames 1 and 50 on the Left Arm layer, and select Motion from the Tween menu in the Property inspector. 4. Repeat step 3 to create a motion tween for the Right Arm layer. 5. Select any frame between frames 50 and 100 on the Left Arm layer, and select Motion from the Tween menu in the Property inspector. 6. Repeat step 5 to create a motion tween for the Right Arm layer. 7. Select frame 50 on the Left Arm layer, and then select the left arm on the Stage. 8. In the Transform panel, type -9 in the Rotate box, and press Enter or Return. Note If the Transform panel isn't visible, choose Window > Transform. 9. Select frame 50 on the Right Arm layer, and select the right arm on the Stage. 10. In the Transform panel, select Skew, and then type 10 for the horizontal skew and -170 for the vertical skew. Press Enter or Return to apply the values. You can use the Free Transform tool to rotate or skew the object on the Stage, but the Rotate and Skew options in the Transform panel give you precise control over movement. [View full size image] Creating Nested Symbols Within the alien symbol is the alien_body symbol, which, in turn, contains the alien_head symbol, which contains the alien_head_eye symbol. You'll use the alien_head_eye symbol as the basis for new symbols that will create the blinking effect. 1. Use the Zoom tool to zoom in on the alien's head so that you'll be able to see the eye clearly. To pan the Stage, press the spacebar as you drag the mouse across the Stage. 2. Double-click the alien's body on the Stage to edit the alien_body symbol. 3. Double-click the alien's head on the Stage to edit the alien_head symbol. Flash displays the Timeline for the alien_head symbol, which contains five layers. 4.