Simple Item Editor-Fact

Hi everyone, I want to use Slider to test a feature. I want to control Altitude setting with slider instead of text in SimpleItemEditor.qml file. When I looked at the codes, I thought if I changed the “AltitudeFactTextField” part, but it didn’t. It also gets an error when I type “FactValueSlider” instead of “AltitudeFactTextField”. When I type QGCSlider or Slider, I cannot access the “fact” and “altitudeMode” properties. I looked at the “Fact” section in the Developer Guide and saw that there is a custom build option. What can I do to create a Custom Fact, or customize it to places where Fact is used, such as SimpleItemEditor.qml? I will be very happy if someone can help me.