diff --git a/packages/webamp-modern-2/src/skin/PopupMenu.ts b/packages/webamp-modern-2/src/skin/PopupMenu.ts
index 71f8c639..92966ad5 100644
--- a/packages/webamp-modern-2/src/skin/PopupMenu.ts
+++ b/packages/webamp-modern-2/src/skin/PopupMenu.ts
@@ -1,15 +1,44 @@
 import BaseObject from "./BaseObject";
+import { assume } from "../utils";
+
+type MenuItem =
+  | {
+      type: "item";
+      text: string;
+      id: number;
+      checked: boolean;
+      disabled: boolean;
+    }
+  | { type: "separator" };
 
 export default class PopupMenu extends BaseObject {
+  _items: MenuItem[] = [];
   addcommand(
     cmdText: string,
     cmd_id: number,
     checked: boolean,
     disabled: boolean
-  ) {}
-  addseparator() {}
+  ) {
+    this._items.push({
+      type: "item",
+      text: cmdText,
+      id: cmd_id,
+      checked,
+      disabled,
+    });
+  }
+  addseparator() {
+    this._items.push({ type: "separator" });
+  }
   checkcommand(cmd_id: number, check: boolean) {
-    // TODO
+    const item = this._items.find((item) => {
+      return item.type === "item" && item.id === cmd_id;
+    });
+    assume(item != null, `Could not find item with id "${cmd_id}"`);
+    if (item.type !== "item") {
+      throw new Error("Expected item to be an item.");
+    }
+    item.checked = check;
   }
   /*
 extern PopupMenu.addSubMenu(PopupMenu submenu, String submenutext);