diff --git a/new/ui.idl b/new/ui.idl
index 0594577c..b67c9392 100644
--- a/new/ui.idl
+++ b/new/ui.idl
@@ -49,6 +49,7 @@ interface Control {
 	func SetParent(c *Container);
 	func PreferredSize(d *Sizing, width *intmax_t, height *intmax_t);
 	func Resize(x intmax_t, y intmax_t, width intmax_t, height intmax_t, d *Sizing);
+	func Visible(void) int;
 	func Show(void);
 	func Hide(void);
 	func Enable(void);