Assigning a child button to Accordion header

Question

I have an Accordion control with several panels. Each header
has an icon and a title. I need to add a child button to the
Accordion header (which is a Button itself and not a container, but
it should be OK). I want to place it on te right side of the
header. I create a 20 x 20 button and add it to the Accordion
header, as a child. I want to place it on the right corner of the
Accordion header, but I am unable to get accurate size measurements
of the header. What I thought would work (using the Accordion
derived custom class) would be ....
for(var i:int=0; i<numChildren; i++)
var header:mx.controls.Button = getHeaderAt(i);
header.addChild(minusButton);
super.measure();
minusButton.x = header.measuredWidth - 20;
but the measureed width always comes up as zero, as opposed
to the actual width of the header? Any ideas what I am doing
wrong?

Answer 1

Set the button's "In" parameter to the same MIDI message your controller is sending.
Now when the button receives a MIDI input with the matching message, it will trigger.
You'll obviously need an environment cable path so that incoming MIDI can reach the button, by whatever means is appropriate.