Flash has another useful tool that you can use to align objects.

If you prefer to work on a stage with organized structure, you can turn on the grid in the flash workspace and align elements using this grid. Similar to most other element in flash, the grid has properties. You can make it visible or invisible, change spacing and color, and choose whether objects snap to grid points, among other things. If you choose view grid show grid, flash will display a grid. You can use the flash grid in two ways: as a visual reference for manually aligning objects to grid intersections, and/or as a virtual reference in which flash snaps an object to intersecting grid points. If you choose view snapping snap to grid, flash will snap an object to grid points as you move it across the stage.
When you employ flash to align objects to grid points, the part of the object that aligns to the grid is the handle you clicked on the object to select it. Every object you create has a bounding box with a handle in its center and a handle for each extremity of the bounding box. As you drag an object, handle by which you are dragging the object becomes larger and darker when it nears a grid intersection point. The default grid will display a light-gray line every 18 pixels along the document’s width and length. You can modify the grid spacing and color to suit the document you are editing. Choose view grid edit grid, and flash will display the grid dialog box.
There are several grid properties you can change in the grid dialog box, such as the color of the grid and the spacing of the grid lines. And grid snapping accuracy can also be customized to suit your particular project. Flash has another useful tool that you can use to align objects in your movies: rulers. When you choose view rulers, flash displays a vertical and a horizontal ruler. The rulers use the unit of measure you specified in the document properties dialog box. If you did not modify the ruler unit’s option when you setup the movie, the rulers use pixels, the flash default, as their unit of measure. When you select an object on the stage and move it, flash displays two small lines on each ruler that correspond to the object’s width and height. As you move an object across the stage, these reference points follow, giving you a preview of the object’s current position. You can use these reference points to accurately position an object on the stage. Rulers are also used to create guides for your document. Another option you can use to align and position objects in your movies is the guides’ features. Guides are visual references that you create and position where needed. You use guides to align elements in much the same way you use a grid. Unlike grids, however, guides can be positioned horizontally and vertically wherever you want them on the stage.