How the value of vertical slider could be shown on top of slider instead of on the left?

I add a vertical slider to gui application but the value is shown on the left.

How could the value could be shown on top of silder?1

slider.setTextBoxStyle(Slider::TextBoxAbove, isReadOnly, textEntryBoxWidth, textEntryBoxHeight);

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Thank you very much!
Again, Could you know how the slider value in the text box could be shown only two decimal digits?


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