diff --git a/AicsKnowledgeBase/qml/component/FileList.qml b/AicsKnowledgeBase/qml/component/FileList.qml
index ab662a5..d1fdb2a 100644
--- a/AicsKnowledgeBase/qml/component/FileList.qml
+++ b/AicsKnowledgeBase/qml/component/FileList.qml
@@ -2,6 +2,7 @@ import QtQuick 2.15
 import QtQuick.Layouts
 import FluentUI
 import "qrc:///AicsKnowledgeBase/qml/global"
+import SignalFileOperation 1.0
 
 Item {
     anchors.fill: parent
@@ -163,7 +164,7 @@ Item {
                 if (model.isDir) {
                     listView.headerItem.add(model.title, model.uuid)
                 } else {
-                    emit: open(model.uuid)
+                    emit: SignalFileOperation.open(model.uuid)
                 }
             }
         }
diff --git a/AicsKnowledgeBase/qml/global/SignalFileOperation.qml b/AicsKnowledgeBase/qml/global/SignalFileOperation.qml
new file mode 100644
index 0000000..e60ce30
--- /dev/null
+++ b/AicsKnowledgeBase/qml/global/SignalFileOperation.qml
@@ -0,0 +1,8 @@
+pragma Singleton
+
+import QtQuick
+
+QtObject {
+    signal open(string file)
+    signal openNote(string note)
+}
diff --git a/AicsKnowledgeBase/qml/page/ContentPage.qml b/AicsKnowledgeBase/qml/page/ContentPage.qml
index debb554..aec6663 100644
--- a/AicsKnowledgeBase/qml/page/ContentPage.qml
+++ b/AicsKnowledgeBase/qml/page/ContentPage.qml
@@ -6,12 +6,14 @@ import QtQuick.Controls.Basic
 import QtWebEngine 1.2
 import FluentUI
 import AicsKB.FileTransferManager
+import SignalFileOperation 1.0
 import "qrc:///AicsKnowledgeBase/qml/page"
 
 FluArea {
     id: content_area
     paddings: 0
     backgroundColor: "#f9f9f9"
+    visible: false
     property string type: ""
     property string knowledgeFileId
     signal download(string knowledgeFileId)
@@ -23,6 +25,13 @@ FluArea {
     //        bottom: 10
     //        left: 10
     //    }
+    Connections {
+        target: SignalFileOperation
+        function onOpen(file) {
+            content_area.visible = true
+        }
+    }
+
     FluScrollablePage {
         id: content_page
         anchors.fill: parent
diff --git a/AicsKnowledgeBase/src/main.cpp b/AicsKnowledgeBase/src/main.cpp
index ef750eb..90a4c4f 100644
--- a/AicsKnowledgeBase/src/main.cpp
+++ b/AicsKnowledgeBase/src/main.cpp
@@ -54,6 +54,8 @@ int main(int argc, char *argv[])
 	qmlRegisterSingletonInstance<FileTransferManager>("AicsKB.FileTransferManager", 1, 0, "FileTransferManager",
 													  fileTransferManager);
 
+    qmlRegisterSingletonType(QUrl("qrc:/AicsKnowledgeBase/qml/global/SignalFileOperation.qml"), "SignalFileOperation", 1, 0,
+                                 "SignalFileOperation");
 
 	const QUrl url(u"qrc:/AicsKnowledgeBase/qml/App.qml"_qs);
 	QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,