diff --git a/Sources/zui/Zui.ts b/Sources/zui/Zui.ts
index 4624c10e..713a9029 100644
--- a/Sources/zui/Zui.ts
+++ b/Sources/zui/Zui.ts
@@ -161,10 +161,8 @@ class Zui {
 	}
 	set t(theme: Theme) {
 		if (this.t != null) {
-			for (let key in theme) {
-				if (key == "theme_") continue;
-				if (key.startsWith("set_")) continue;
-				if (key.startsWith("get_")) key = key.substr(4);
+			for (let key of Object.getOwnPropertyNames(Theme.prototype)) {
+				if (key == "constructor") continue;
 				let t_: any = this.t;
 				let theme_: any = theme;
 				t_[key] = theme_[key];