I have the same problem, and I really want to add them to the same window as the plugin does for item.
I've been waiting for more reply under this topic for a few months and then decided to have a try on it .
By looking at the last few lines of the original plugin and the rpg_object.js, I added in these after line 120:
Game_Actor.prototype.displayLevelUp = function(newSkills) {
var text = TextManager.levelUp.format(this._name, TextManager.level, this._level);
this.drawText(TextManager.levelUp, x, y)
newSkills.forEach(function(skill) {
this.drawText((TextManager.obtainSkill.format(skill.name), x, y);
y += lineHeight;
}, this);
But it seems like this edition turns off the plugin completely. I feel like it is because I did not define some of the skill condition but I am not sure how to fix it.
I know these few lines looks like rubbish to scripters here, but I have no basic knowledge and just start to learning. I just think it is always good to learn by trying things. If anyone here could help, it will be thankful.
Sorry for my bad English.
(I am not sure if I should make a new topic in Learning Javascript board, since the topic already exist here. )