You can use the Snap to Grid option to automatically snap objects that you place on the form design to the nearest point on the grid. The Snap to Grid option is available in the Drawing Aids palette and from the View menu.
When you move an object, Snap to Grid ensures that the X and Y coordinates of the object’s anchor point are evenly divisible by the grid unit. If an object’s width or height is not evenly divisible by the current grid unit, you cannot position the object beyond that last grid point where it will not exceed the extent of the page content area.
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If Snap to Grid is selected, the only way to position an object tightly against the right or bottom edge of the page is to ensure that its width and height are evenly divisible by the grid unit. The simplest way to achieve this is to resize the object by dragging the bottom-left corner while Snap to Grid is selected. Snap to Grid will restrict the size of the object to even multiples of the grid unit.
See also 

Using Snap to Grid