- static const Property::Index LOWER_BOUND_PROPERTY; ///< Property, name "lower-bound", type FLOAT
- static const Property::Index UPPER_BOUND_PROPERTY; ///< Property, name "upper-bound", type FLOAT
- static const Property::Index VALUE_PROPERTY; ///< Property, name "value", type FLOAT
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- static const Property::Index HIT_REGION_PROPERTY; ///< Property, name "hit-region", type VECTOR2
- static const Property::Index BACKING_REGION_PROPERTY; ///< Property, name "backing-region", type VECTOR2
- static const Property::Index HANDLE_REGION_PROPERTY; ///< Property, name "handle-region", type VECTOR2
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- static const Property::Index BACKING_IMAGE_NAME_PROPERTY; ///< Property, name "backing-image-name", type STRING
- static const Property::Index HANDLE_IMAGE_NAME_PROPERTY; ///< Property, name "handle-image-name", type STRING
- static const Property::Index PROGRESS_IMAGE_NAME_PROPERTY; ///< Property, name "progress-image-name", type STRING
- static const Property::Index POPUP_IMAGE_NAME_PROPERTY; ///< Property, name "popup-image-name", type STRING
- static const Property::Index POPUP_ARROW_IMAGE_NAME_PROPERTY; ///< Property, name "popup-arrow-image-name", type STRING
-
- static const Property::Index DISABLE_COLOR_PROPERTY; ///< Property, name "disable-color", type VECTOR4
- static const Property::Index POPUP_TEXT_COLOR_PROPERTY; ///< Property, name "popup-text-color", type VECTOR4