  *  <p>Transitions in DataGrid item renderers aren't supported. The GridItemRenderer class 
  *  has disabled its <code>transitions</code> property so setting it will have no effect.</p>
  * 
- *  <h2>Efficiency Considerations</h2>
+ *  <p><b>Efficiency Considerations</b></p>
  *  
  *  <p>DataGrid scrolling and startup performance are directly linked
  *  to item renderer complexity and the number of item renderers that

                                                       null, 
                                                       new Point(x, y)); 
        toolTip.move(pt.x, pt.y);
	}
         
   //--------------------------------------------------------------------------
    //

        if ((rendererR.height == 0) || (rendererR.width == 0))
            return;
            
        // Determine if the toolTip needs to be adjusted for RTL layout.
        const mirror:Boolean = renderer.layoutDirection == LayoutDirection.RTL;
        
        // Lazily compute the tooltip text and recalculate its width.
        toolTip.text = renderer.column.itemToDataTip(renderer.data);
        ToolTipManager.sizeTip(toolTip);
        
        // We need to position the tooltip at same x coordinate, 
        // center vertically and make sure it doesn't overlap the screen.
        // Call the helper function to handle this for us.
