[flexcoders] event bubbling when destination below target?

[Mic]

I am using both Cairngorm events and custom  actionscript events but
cannot work out how either will allow a combobox at the outer app
container to communicate with charts within modules within a panel
within a canvas within the app etc. Is it true to say that Cairngorm
events are mainly for grabbing data from servers and populating
"global" dtos in the modelLocator as the Cairngorm commands are
totally unaware of mxml/actionscript gui components? And is it true to
say that Flex events cannot descend below the target, as bubbling
seems to go no lower than the target? I have the following layout:

Application
   Canvas
         comboBox - changeTimePeriod
      Panel
         HDivideBox
            VDivideBox
               Panel
                  Module = Chart
                     function changeTimePeriod()
               Panel
                  Module = Chart
                     function changeTimePeriod()
            VDivideBox
               Panel
                  Module = Chart
                     function changeTimePeriod()
               Panel
                  Module = Chart
                     function changeTimePeriod() 

I talk to the chart modules from the immediate parent using
IModuleInterface. But how do I push the outer comboBox event down,
down, down into the depths? Without hard-coding function calls - 
parent to child, parent to child etc? Thanks in advance,

Mic