How to create custom widget element?

Development Programming & Scripting UI
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1

Hi! I try to create Double Slider (as on pic)

114940-doubleslider.png

by inhereting it from usual Slider, but get no luck. Can anyone help me with this?

2

DoubleSlider.cpp and DoubleSlider.h in attachment zip folder

link text

3

Hello, does it work on 4.26 or you happen to have an updated version? Thanks