In GraphBuilder, the user can "talk synchronously to several FrameBoxes at once" if he presses CTRL while triggering an action:
Remove non labels from hovering information
Use CTRL to talk to multiple boxes in Graph Builder
very convenient 
Now, I asked myself: what happens if additional FrameBoxes appear - either because rows were added to the data table or because the Data filter was changed.
The Background: Some "strange" behavior of Graph Builder which I noticed before but couldn't describe precisely enough to get a hint "why":
Sometimes settings are "inherited" automatically when a plot is split into subplots, sometimes the user has to set the settings again for the subplots.
The surprising answer (If generalization from 2-3 examples is right): 2 examples later ...
Some findings (but: full picture is more complicated)
- If there is a tiny difference between the settings of the existing FrameBoxes (1st example: different Fill Selection Mode), the settings are not used for additional FrameBoxes -- not even settings that were identical (Background setting) .
- If ALL settings of ALL existing Frameboxes are exactly the same, this common set of settings is used for the new FrameBoxes as well.
This is illustrated in the second step: the GraphBuilder is restricted (again) to 2 FrameBoxes, but now the Fill Selection Mode setting is matched for both FrameBoxes. Now, all settings are the same - and when the Data Filter is removed, the common set of settings is used for the new FrameBoxes as well.
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dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
gb = dt << Graph Builder(
Size( 534, 496 ),
Show Control Panel( 0 ),
Graph Spacing( 4 ),
Variables( X( :height ), Y( :weight ), Wrap( :age ) ),
Elements( Points( X, Y, Legend( 9 ) ), Smoother( X, Y, Legend( 10 ) ) ),
Local Data Filter(Add Filter( columns( :age ), Where( :age == {12, 13} ) ) )
);
frameboxes = Report( gb ) << xpath( "//FrameBox" );
For Each( {fb, idx}, frameboxes, fb << Background Color( 10 ) );
frameboxes[1] << Fill Selection Mode( "Selected Darker" );
Wait( 2 );
gb << Remove Local Data Filter;
wait(2);
gb << Local Data Filter( Add Filter( columns( :age ), Where( :age == {12, 13} ) ) );
frameboxes = Report( gb ) << xpath( "//FrameBox" );
For Each( {fb, idx}, frameboxes, fb << Fill Selection Mode( "Selected Darker" ) );
Wait( 2 );
gb << Remove Local Data Filter;