How to manage layers in Flash CS4

All this while we were working on flash CS4 on stage on a single layer, now lets just draw a simple website design by creating a rectangle green color menu bar in layer1, by double clicking on the layer1, you will be able to change the name of the layer, say call it menu,

On the left bottom of this picture above, you will find an add layer button, you will be able to create layers by simply clicking on it,  if you notice very closely that there is a dark grey box in the time line of the layer header, that means we have put in an object on stage, similarly create another layer and make another rectangle yellow box on top of the page, similarly create another layer and write your company name on it, you can double click on each layer and name them differently, you will notice that you have three grey boxes with a black dot in each layer on the time line 1. this is to make sure that each layer does not interfear with each other.
You can make each of these layers invisible by simply clicking on the eye button in the respective layer

in case you want to edit the bottom layer and you are unable to do it, you can also click on the lock button like the one below

to make sure, that you don’t move it around. So get used to using the pad lock icons by simply clicking to make it invisible and lock them and by clicking on it, to make it visible and unlock them.
Your drawing will look something like this on three layers.

So you know how to manage layers in flash Cs4, I would recommend that you always label your layers, suppose you draw a whole lot of drawings on stage, and later if you want to edit it, you may not know what each layer contains, again you can delete any layer any time by  simply click on the layers, selecting it, and clicking on the trashcan found on the right bottom of pic1, it will look like this

Notice one more important thing while working in flash, if at any point you think you want to undo, you can simply click ctrl+z on your keyboard, and you can get it back.
There is another button between creating layers and deleting layers in the pic1. these are adding folders, by clicking on it, you can add a folder and store all your files by dragging and dropping them into that folder, and naming that folder header folder.