diff --git a/orx-jvm/orx-gui/src/demo/kotlin/DemoOptions01.kt b/orx-jvm/orx-gui/src/demo/kotlin/DemoOptions01.kt
index d650b92f..161bfded 100644
--- a/orx-jvm/orx-gui/src/demo/kotlin/DemoOptions01.kt
+++ b/orx-jvm/orx-gui/src/demo/kotlin/DemoOptions01.kt
@@ -25,6 +25,9 @@ fun main() = application {
 
         gui.add(settings)
         extend(gui)
+        gui.onChange { name, value ->
+            println("$name: $value")
+        }
         extend {
             when (settings.option) {
                 BackgroundColors.Pink -> drawer.clear(ColorRGBa.PINK)
diff --git a/orx-jvm/orx-gui/src/main/kotlin/Gui.kt b/orx-jvm/orx-gui/src/main/kotlin/Gui.kt
index 87c65662..be676ab3 100644
--- a/orx-jvm/orx-gui/src/main/kotlin/Gui.kt
+++ b/orx-jvm/orx-gui/src/main/kotlin/Gui.kt
@@ -730,6 +730,8 @@ class GUI(
                             obj,
                             it.value.data as? Enum<*> ?: error("no data")
                         )
+
+                        onChangeListener?.invoke(parameter.property!!.name, it.value.data as? Enum<*> ?: error("no data"))
                     }
                     getPersistedOrDefault(
                         compartment.label,