public ColorPickerTests()
{
_colorPicker = new ColorPicker();
_colorPicker.ApplyDefaultStyle();
_colorPicker.Arrange(new Rect(0, 0, 400, 100));
_hueSlider = _colorPicker.FindVisualChild <Slider>(ColorPicker.HueSliderPartName);
_saturationBrightnessPicker = _colorPicker.FindVisualChild <Canvas>(ColorPicker.SaturationBrightnessPickerPartName);
_saturationBrightnessPickerThumb = _colorPicker.FindVisualChild <Thumb>(ColorPicker.SaturationBrightnessPickerThumbPartName);
}