/// <summary>
/// Synchronize UI with current data
/// </summary>
private void UIChanged()
{
OnButtonEnabled("learn", _skills.IsLearnable(skillSelectedId) && _skillPoints >= _skills.GetSkillInfo(skillSelectedId).cost);
OnButtonEnabled("forget", _skills.IsForgetable(skillSelectedId));
OnTextBoxChanged("cost", _skills.GetSkillInfo(skillSelectedId).cost.ToString());
OnTextBoxChanged("skill_points", _skillPoints.ToString());
}