diff --git a/plugins/ui/src/js/src/elements/TabPanels.tsx b/plugins/ui/src/js/src/elements/TabPanels.tsx
index a68bde3aa..845d9b324 100644
--- a/plugins/ui/src/js/src/elements/TabPanels.tsx
+++ b/plugins/ui/src/js/src/elements/TabPanels.tsx
@@ -1,11 +1,12 @@
 import React from 'react';
 import {
+  ItemElement,
   TabPanels as DHCTabPanels,
   TabPanelsProps as DHCTabPanelsProps,
 } from '@deephaven/components';
 
 export function TabPanels(
-  props: DHCTabPanelsProps<React.ReactNode>
+  props: DHCTabPanelsProps<ItemElement | ItemElement[]>
 ): JSX.Element {
   const { UNSAFE_style: unsafeStyle, ...otherProps } = props;
 
diff --git a/plugins/ui/src/js/src/widget/WidgetTypes.ts b/plugins/ui/src/js/src/widget/WidgetTypes.ts
index 23a8d58f5..bb8e196d3 100644
--- a/plugins/ui/src/js/src/widget/WidgetTypes.ts
+++ b/plugins/ui/src/js/src/widget/WidgetTypes.ts
@@ -8,7 +8,7 @@ export interface WidgetMessageDetails {
   exportedObjects: dh.WidgetExportedObject[];
 }
 
-export type WidgetMessageEvent = CustomEvent<WidgetMessageDetails>;
+export type WidgetMessageEvent = dh.Event<WidgetMessageDetails>;
 
 export type WidgetFetch = (takeOwnership?: boolean) => Promise<dh.Widget>;