import controlP5.*;
ControlP5 cp5;

public int szansaB1 = 50;
public int szansaB2 = 50;

void draw() {
cp5 = new ControlP5(this);

Numberbox nb1 = cp5.addNumberbox("szansaB1",szansaB1,10,10,42,16);
nb1.setMultiplier(10);
nb1.setMax(100);
nb1.setMin(0);

Numberbox nb2 = cp5.addNumberbox("szansaB2",szansaB2,10,50,42,16);
nb2.setMultiplier(10);
nb2.setMax(100);
nb2.setMin(0);

szansaB1 = 100 - szansaB2;
szansaB2 = 100 - szansaB1;

println("szansaB1: " + szansaB1 + "");
println("szansaB2 :" + szansaB2 + "");

}

You have 2 values to change. To update an value you have to right click on it and drag mouse down and/or up. As you can see I can't update the top value, simply because it stays... it's still " szansaB1 = 100 - szansaB2 ", and " szansaB2 " is constant. Maybe I should use " update() " function or " setValue() " somehow ? Or I should update " szansaB1 " just in another place ? Any idea ?

http://www.sojamo.de/libraries/controlP5/reference/controlP5/Numberbox.html