diff --git a/components/canvas/CanvasChatPanel.tsx b/components/canvas/CanvasChatPanel.tsx
index 9b443fb3e..6abced1f1 100644
--- a/components/canvas/CanvasChatPanel.tsx
+++ b/components/canvas/CanvasChatPanel.tsx
@@ -329,11 +329,16 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
           </Button>
           <button 
             type="button"
-            className="h-10 w-10 rounded-full inline-flex items-center justify-center bg-red-500 text-white border-4 border-yellow-400 animate-pulse"
+            className="h-10 w-10 rounded-full inline-flex items-center justify-center bg-red-500 text-white border-4 border-yellow-400 animate-pulse relative z-[9999]"
+            onMouseDown={(e) => {
+              e.preventDefault();
+              e.stopPropagation();
+              alert('🎯 MouseDown! onOpenFileList: ' + !!onOpenFileList);
+            }}
             onClick={(e) => {
               e.preventDefault();
               e.stopPropagation();
-              alert('🎯 这是聊天面板中的文件列表按钮! onOpenFileList: ' + !!onOpenFileList);
+              alert('🎯 Click! onOpenFileList: ' + !!onOpenFileList);
               console.log('[CanvasChatPanel] File list button clicked, onOpenFileList:', !!onOpenFileList);
               if (onOpenFileList) {
                 onOpenFileList();