Hello,if you opt for ShowRange slider, changing the value of the right knob(rangeEnd) is not trigerring propertyChanged events if both knobs are on same value(for example both are set to 0).It only starts sending propertyChanged events after you also move the left knob from their original position.
Scenario:
Set a rangeSlider to ShowRange="True",Minimum="-50", Maximum"50". Move the right(end value) knob and see that the propertyChanged events are not triggered,move the left (start value) knob and afterwards move the left knob again and note that now the propertyChanged events are trigerred.This issue happens again if you select the same values again,like you move both knob to any same value(-20 for example).
Regards,Norbert