diff --git a/components/canvas/CanvasChatPanel.tsx b/components/canvas/CanvasChatPanel.tsx
index 9669f36da..9ed8ab51e 100644
--- a/components/canvas/CanvasChatPanel.tsx
+++ b/components/canvas/CanvasChatPanel.tsx
@@ -329,10 +329,11 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
           </Button>
           <button 
             type="button"
-            className="h-8 w-8 rounded-full hover:bg-muted inline-flex items-center justify-center"
+            className="h-8 w-8 rounded-full hover:bg-muted inline-flex items-center justify-center bg-blue-500 text-white"
             onClick={(e) => {
               e.preventDefault();
               e.stopPropagation();
+              alert('File list button clicked! onOpenFileList: ' + !!onOpenFileList);
               console.log('[CanvasChatPanel] File list button clicked, onOpenFileList:', !!onOpenFileList);
               if (onOpenFileList) {
                 onOpenFileList();