      *  define the height of all container children, 
      *  as the following example shows:</p>
      * 
-     *  <pre>&lt;s:Group&gt;
-          &lt;s:layout&gt;
-            &lt;s:VerticalLayout variableRowHeight="false"
-                typicalLayoutElement="{b3}"/&gt; 
-          &lt;/s:layout&gt;
-          &lt;s:Button id="b1" label="Button 1"/&gt;
-          &lt;s:Button id="b2" label="Button 2"/&gt;
-          &lt;s:Button id="b3" label="Button 3" fontSize="36"/&gt;
-          &lt;s:Button id="b4" label="Button 4" fontSize="24"/&gt;
-        &lt;/s:Group&gt;</pre>
+     *  <pre>
+     *  &lt;s:Group&gt;
+     *    &lt;s:layout&gt;
+     *      &lt;s:VerticalLayout variableRowHeight="false"
+     *          typicalLayoutElement="{b3}"/&gt; 
+     *    &lt;/s:layout&gt;
+     *    &lt;s:Button id="b1" label="Button 1"/&gt;
+     *    &lt;s:Button id="b2" label="Button 2"/&gt;
+     *    &lt;s:Button id="b3" label="Button 3" fontSize="36"/&gt;
+     *    &lt;s:Button id="b4" label="Button 4" fontSize="24"/&gt;
+     *  &lt;/s:Group&gt;</pre>
      * 
      *  <p>If this property has not been set and the target is non-null 
      *  then the target's first layout element is cached and returned.</p>

        if (!scrollRect)
            return null;

		// Make sure that the drag-scrolling regions don't overlap 
		var x:Number = dropLocation.dropPoint.x;
		var y:Number = dropLocation.dropPoint.y;
		
		var horizontalRegionSize:Number = Math.min(dragScrollRegionSizeHorizontal, layoutTarget.width/2);
		var verticalRegionSize:Number = Math.min(dragScrollRegionSizeVertical, layoutTarget.height/2);
		// Return early if the mouse is outside of the drag-scroll region.
		if (scrollRect.left + horizontalRegionSize < x && x < scrollRect.right - horizontalRegionSize &&
			scrollRect.top + verticalRegionSize < y && y < scrollRect.bottom - verticalRegionSize )
			return null;
		
		if (timeElapsed < dragScrollInitialDelay)
			return new Point(); // Return zero point to continue firing events, but not actually scroll.
		timeElapsed -= dragScrollInitialDelay;

        // Speedup based on time elapsed
        var timeSpeedUp:Number = Math.min(timeElapsed, 2000) / 2000;

 *  you must extend <code>LayoutBase</code> or one of its subclasses.
 *
 *  <p>At minimum, subclasses must implement the <code>updateDisplayList()</code>
 *  method, which positions and sizes the <code>target</code> GroupBase's elements, and 
 *  the <code>measure()</code> method, which calculates the default
 *  size of the <code>target</code>.</p>
 *
 *  <p>Subclasses may override methods like <code>getElementBoundsAboveScrollRect()</code>
 *  and <code>getElementBoundsBelowScrollRect()</code> to customize the way 
