Inverse Kinematics (bone tool in Flash)

Kinematics describes the motion of points, bodies (objects) and systems of bodies (objects).
Inverse kinematics refers to the movement of a device at the end of the robotic arm.

You need to ensure that you are working with movie clips (not graphics) for the bone tool to work.
Therefore, if you are drawing an arm, you need to convert each section of the arm (eg shoulder, elbow, forearm, hand) into a symbol.

Modify - Convert to Symbol OR F8 (windows) fn F8 (Mac)

When you work with the bone tool, Flash will create a new layer - armature.

Further tutorials