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228 GLG User’s Manual and Builder Reference To add or delete objects from the selection, Ctrl-click on the objects with the left mouse button. For example, you could select multiple objects by Ctrl-clicking on them with the mouse. Ctrl-clicking on an object which is already selected deletes it from the selection. The Edit menu provides more selection options: Select All, Select Multiple Objects and Select Rectangular Area, which may be used when the drawing has no empty space, making it impossible to define the selection rectangle with the mouse without selecting an object. The Arrange, Permanent Group option changes the group type from temporary to permanent and back. The Arrange menu also provides explicit options for creating both temporary and permanent groups, as well as selecting multiple objects. A permanent group can also be created by using Object, Create, Group, and drawing a rectangle that touches or encloses all the objects you want to include in the group. Release the objects from the group by selecting the group and using Arrange, Explode, Object. See the Associating Objects Together chapter on page 266 for information on how to perform an action on objects in a group. Editing Objects Creating an object adds a graphical object to the drawing and another branch to the object hierarchy. The object is created with default attributes that control its appearance. The Builder lets you change the object. You can: • To change its appearance, edit its attributes. • To change its size, move its box points. • To change its geometry, move or edit its control points. • To flip the object, click on one of the Flip Object icons in the Control Panel on the left of the Drawing Area. • To rotate the object, move its rotate point. • To scale or rotate the object by a precise amount, click on the Transform Object icon in the Control Panel on the left of the Drawing Area, then select a desired transformation type and define its parameters. • Constrain the object (or any of its attributes) to another object or attribute; see page 235. • Define and attach dynamic transformations to the object or to its attributes; see page 238. • For gradient fill, cast shadows, arrowheads and fill dynamics, attach Rendering to the selected object; see page 271. • Attach Box Attributes to the selected text object; see page 271. • Attach Custom Properties, Aliases and History objects to the selected object; see page 273, page 274 and page 272. To prototype the object’s run-time behavior, you can animate it with simulated or random data; see page 256.