When in non-stacked mode, how to set which overlapping object is on top?

[ghost]

On my timeline, I have some large objects (think of something like hurricane) with some smaller objects nested inside (think something like lightening.) I have the group stacked=false, and when the timeline is first rendered, the lightening objects are visible and on top of the hurricane objects. However, if I scroll the objects out of view to the left, then back into view, the lightening objects are no longer visible. By experimenting with opacity, I was able to determine that the lightening objects are still there, but they're now under the hurricane objects. Is there any way to ensure that some objects are on top of others when in non-stacked mode? Thanks.