Can't change background colour of linear bar vertical slider

[dariop]

Hi, I’m using linear vertical bar sliders like it describes in this post here:

How To Make Click&Drag Number Box Slider (Without the Slider)?

In case anyone arrives here from Google like I did, there’s an easy way to make a draggable number box without overriding LookAndFeelMethods or writing any custom classes, simply: slider.setSliderStyle(Slider::SliderStyle::LinearBarVertical); slider.setSliderSnapsToMousePosition(false); slider.setColour(Slider::trackColourId, Colours::transparentBlack); slider.setSize(60, 20);

and now I’m simply trying to change the background colour however I can’t seem to get it to work.
I have tried:

setColour(juce::Slider::textBoxBackgroundColourId, juce::Colours::grey);

and

setColour(juce::Slider::backgroundColourId, juce::Colours::grey);

but neither of these works.
How am I supposed to do this?

Thanks