25 July 2010
For help in aligning objects when drawing in Adobe Flash Professional, create guide layers and align objects on other layers to the objects you create on the guide layers. Guide layers are not exported and do not appear in a published SWF file. Any layer can be a guide layer. Guide layers display a guide icon to the left of the layer's name.
Although you cannot drag a motion tween layer or inverse kinematics pose layer onto a guide layer, you can drag a normal layer onto a guide layer. This converts the guide layer to a motion guide layer and links the normal layer to the new motion guide layer.
To create a guide layer, select the layer and right-click (or Control-click) and select Guide from the context menu that appears. To change the layer back to a normal layer, select the Guide option again.
To control the movement of objects in a classic tween animation, create a motion guide layer.
Note: To prevent accidentally converting a guide layer, it is a best practice to place all of the guide layers at the bottom of the layer stacking order in the Timeline.
To learn more about working with guide layers, see the section titled Guide layers in the Flash documentation.