             }
             case NavigationUnit.PAGE_DOWN:
             {
-                // Page down to last fully visible row on the page.  If there is
+                // Page down past the last fully visible row on the page.  If there is
                 // a partially visible row at the bottom of the page, the next
                 // page down should include it in its entirety.
                 visibleRows = grid.getVisibleRowIndices();

     *  method. 
     */ 
    mx_internal var editor:DataGridEditor;

    //--------------------------------------------------------------------------
    //
    //  Properties 

                    // Visible rows have been updated so figure out which one
                    // is now the last fully visible row.
                    visibleRows = grid.getVisibleRowIndices();
                    lastVisibleRowIndex = Math.min(rowCount - 1, visibleRows[visibleRows.length - 1])
                    if (visibleRows.length >= 0)
                    {
                        lastVisibleRowBounds = grid.getRowBounds(lastVisibleRowIndex);
