Apple Final Cut Express HD - Manual (Page 710)

710 Part IX Effects
Using Wireframe Handles to Transform, Scale, and Rotate
In many instances, you may find that dragging the handles of a selected clip in the
Canvas is faster and more intuitive than adjusting its parameters in the Motion tab of
the Viewer.
Note: You must be in Image+Wireframe or Wireframe mode to use wireframe handles.
To scale a clip:
1 Select a clip in the Timeline.
2 Select the Selection tool in the Tool palette, then do one of the following:
 To scale the clip proportionally: Drag a corner handle.
 To scale the clip without constraining the proportions: Shift-drag a corner handle.
Drag a corner handle
to scale proportionally.
Shift-drag a corner
handle to scale in one
direction or the other.