protected override void OnLoading()
{
base.OnLoading();
var element = Controller.Element;
_smoothing = MouseWheel.GetZoomSmoothing(element);
_modifiers = MouseWheel.GetZoomModifiers(element);
MouseWheel.ZoomSmoothingProperty.AddValueChanged(element, OnSmoothingChanged);
MouseWheel.ZoomModifiersProperty.AddValueChanged(element, OnModifiersChanged);
}
private void OnModifiersChanged(object sender, EventArgs e)
{
_modifiers = MouseWheel.GetZoomModifiers(sender as DependencyObject);
}