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Storyboard embedded SfRangeSlider throws null reference exception when dragging a knob

When embedding an SfRangeSlider in a storyboard, when dragging the knob on that control a null reference exception is thrown.


When directly creating the control in code, this problem does not occurr.


Looking at the decompiled code, it seems that the dragEventArgs field is never assigned in the constructor that takes in an IntPtr from the storyboard, however, the empty constructor does assign this field, so the NRE never happens.