diff --git a/example-ui-radiobutton/Makefile b/example-ui-radiobutton/Makefile
index f1f692a..2ed1d98 100644
--- a/example-ui-radiobutton/Makefile
+++ b/example-ui-radiobutton/Makefile
@@ -1,3 +1,5 @@
 all:
-	go get -v -t -u .
 	go install
+
+prep:
+	go get -v -t -u .
diff --git a/example-ui-radiobutton/main.go b/example-ui-radiobutton/main.go
index 8a84fbc..65cb3fa 100644
--- a/example-ui-radiobutton/main.go
+++ b/example-ui-radiobutton/main.go
@@ -1,5 +1,6 @@
 package main
 
+import "log"
 import "github.com/andlabs/ui"
 import _ "github.com/andlabs/ui/winmanifest"
 
@@ -57,6 +58,12 @@ func makeNumbersPage() ui.Control {
 	ecbox.Append("Editable Item 3")
 	vbox.Append(ecbox, false)
 
+	ecbox.OnChanged(func(*ui.EditableCombobox) {
+		log.Println("test")
+		test := ecbox.Text()
+		log.Println("test=", test)
+	})
+
 	rb := ui.NewRadioButtons()
 	rb.Append("Radio Button 1")
 	rb.Append("Radio Button 2")