Flash Catalyst supports an "on application start" event. On the first page/state of your project, make sure nothing is selected. In the interactions panel, it should be labeled Application. Click the Add Interaction button. Select the On Application Start event. You are probably going to want to use the Play Action Sequence option. Then select the elements on the initial state, and begin to apply your effects.
I attached a simple demo of a square both fading and moving in at application start.
thank u, that was what I needed.