 
 import spark.components.supportClasses.GroupBase;
 import spark.core.NavigationUnit;
+import spark.layouts.supportClasses.DropLocation;
 import spark.layouts.supportClasses.LayoutBase;
 
 /**

        bounds.bottom = bottomEdge(row);
        return bounds;
    }
}
}

        if (!g || (index < 0) || (index >= g.numElements)) 
            return null;

        var col:int;
        var row:int;
        if (orientation == TileOrientation.ROWS)
        {
            col = index % _columnCount;
            row = index / _columnCount;
        }
        else
        {
            col = index / _rowCount;
            row = index % _rowCount
        }
        return new Rectangle(leftEdge(col), topEdge(row), _columnWidth, _rowHeight);
    }

