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With Flash’s rectangle- and oval-primitive tools, you create shapes with paths defined by a set of properties specific to that shape. You can’t change the outline of a primitive-shape freely the way you can reshape the outline of a merge-shape or drawing-object. You can change the primitive’s defining properties by dragging control points in the shape or by setting new values in the Property inspector.
1. Using the selection tool, select the rectangle-primitive you want to modify.
The shape’s bounding box highlights, and control points appear . Each corner has two control points. For sharp corners with a corner-radius setting of 0, the points sit directly on top of one another. For rounded corners, a control point appears at both ends of the arc that defines the corner. The two points work in concert—dragging one moves the other.