Adobe Flash Professional CC 2014 v.13.0 - Manual (Page 253)

Note:
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To scale a linear gradient or a fill, drag the square handle at the center of the bounding box.
To change the focal point of a circular gradient, drag the middle circular handle on the bounding circle.
To skew or slant a fill within a shape, drag one of the circular handles on the top or right side of the bounding box.
To tile a bitmap inside a shape, scale the fill.
To see all the handles when working with large fills or fills close to the edge of the Stage, select View > Pasteboard.
Lock a gradient or bitmap to fill the Stage
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