Here is a complete listing of the example source file.
import QtQuick 2.11
import QtQuick.Controls 2.1
import QtQuick.Layouts 1.3
 
 
ElementSettings {
    element: actuator
 
    property MotorActuator actuator
 
 
    GroupBox {
        title: qsTr("Custom properties")
 
        Layout.fillWidth: true
 
        GridLayout {
            columns: 2
 
            Label {
                text: qsTr("Symbol:")
            }
 
            TextField {
                text: actuator.symbol
 
                onTextChanged: actuator.symbol = text
            }
 
            Label {
                text: qsTr("Start angle:")
            }
 
            Slider {
                from: 0
                to: 100
 
                value: actuator.start * 100
 
                onValueChanged: actuator.start = value / 100
            }
 
            Label {
                text: qsTr("Value:")
            }
 
            Slider {
                from: 0
                to: 100
 
                value: actuator.value * 100
 
                onValueChanged: actuator.value = value / 100
            }
        }
    }
}