Update note pitch value

I am working on a plugin that updates note pitch values. However, some notes reflect the updated values on the score, and others do not.
Example:
var refPitch = cursor.element.notes[0].pitch;
cursor.next();

while (cursor.segment != null && cursor.tick <= endTick) {
if (cursor.element.type == Element.CHORD) {
cursor.element.notes[0].pitch = refPitch;
}
cursor.next();
}

When the script ends, the pitch values for the notes are correct, but the displayed score doesn't reflect the changes. Is there a function to redraw the score?