+ <customwidget>
+ <class>NonLinearFader</class>
+ <extends>QSlider</extends>
+ <header>nonlinear_fader.h</header>
+ </customwidget>
+ <customwidget>
+ <class>ClickableLabel</class>
+ <extends>QLabel</extends>
+ <header>clickable_label.h</header>
+ </customwidget>