diff --git a/src/event/Event.cpp b/src/event/Event.cpp
index 454f11d..54947d9 100644
--- a/src/event/Event.cpp
+++ b/src/event/Event.cpp
@@ -165,3 +165,7 @@ void EventRegisterEx(EVENTID id, EVENTHANDLERFUNC handler, void* param, float pr
         }
     }
 }
+
+void EventUnregisterEx(EVENTID id, EVENTHANDLERFUNC handler, void* param, uint32_t flags) {
+    // TODO
+}
diff --git a/src/event/Event.hpp b/src/event/Event.hpp
index 4d9e628..e27f1b7 100644
--- a/src/event/Event.hpp
+++ b/src/event/Event.hpp
@@ -57,6 +57,8 @@ void EventRegister(EVENTID id, int32_t (*handler)(const void*, void*));
 
 void EventRegisterEx(EVENTID id, int32_t (*handler)(const void*, void*), void* param, float priority);
 
+void EventUnregisterEx(EVENTID id, EVENTHANDLERFUNC handler, void* param, uint32_t flags);
+
 void OsNetPump(uint32_t timeout);
 
 #endif
diff --git a/src/ui/CSimpleTop.cpp b/src/ui/CSimpleTop.cpp
index 4db99bd..50e7911 100644
--- a/src/ui/CSimpleTop.cpp
+++ b/src/ui/CSimpleTop.cpp
@@ -397,10 +397,37 @@ CSimpleTop::CSimpleTop() : CLayoutFrame() {
     CSimpleTexture::Init();
 }
 
+CSimpleTop::~CSimpleTop() {
+    // TODO
+
+    this->DisableEvents();
+
+    HandleClose(this->m_screenLayer);
+
+    CSimpleTop::s_instance = nullptr;
+
+    // TODO
+}
+
 void CSimpleTop::CompressStrata(int32_t strata) {
     // TODO
 }
 
+void CSimpleTop::DisableEvents() {
+    EventUnregisterEx(EVENT_ID_CHAR, reinterpret_cast<EVENTHANDLERFUNC>(CSimpleTop::OnChar), this, -1);
+    EventUnregisterEx(EVENT_ID_IME, reinterpret_cast<EVENTHANDLERFUNC>(CSimpleTop::OnIme), this, -1);
+    EventUnregisterEx(EVENT_ID_KEYDOWN, reinterpret_cast<EVENTHANDLERFUNC>(CSimpleTop::OnKeyDown), this, -1);
+    EventUnregisterEx(EVENT_ID_KEYUP, reinterpret_cast<EVENTHANDLERFUNC>(CSimpleTop::OnKeyUp), this, -1);
+    EventUnregisterEx(EVENT_ID_KEYDOWN_REPEATING, reinterpret_cast<EVENTHANDLERFUNC>(CSimpleTop::OnKeyDownRepeat), this, -1);
+    EventUnregisterEx(EVENT_ID_MOUSEMOVE, reinterpret_cast<EVENTHANDLERFUNC>(CSimpleTop::OnMouseMove), this, -1);
+    EventUnregisterEx(EVENT_ID_MOUSEMOVE_RELATIVE, reinterpret_cast<EVENTHANDLERFUNC>(CSimpleTop::OnMouseMoveRelative), this, -1);
+    EventUnregisterEx(EVENT_ID_MOUSEDOWN, reinterpret_cast<EVENTHANDLERFUNC>(CSimpleTop::OnMouseDown), this, -1);
+    EventUnregisterEx(EVENT_ID_MOUSEUP, reinterpret_cast<EVENTHANDLERFUNC>(CSimpleTop::OnMouseUp), this, -1);
+    EventUnregisterEx(EVENT_ID_MOUSEWHEEL, reinterpret_cast<EVENTHANDLERFUNC>(CSimpleTop::OnMouseWheel), this, -1);
+    EventUnregisterEx(EVENT_ID_SIZE, reinterpret_cast<EVENTHANDLERFUNC>(CSimpleTop::OnDisplaySizeChanged), this, -1);
+    EventUnregisterEx(EVENT_ID_FOCUS, reinterpret_cast<EVENTHANDLERFUNC>(CSimpleTop::OnFocusChanged), this, -1);
+}
+
 void CSimpleTop::EnableEvents() {
     EventRegisterEx(EVENT_ID_CHAR, reinterpret_cast<EVENTHANDLERFUNC>(CSimpleTop::OnChar), this, 1.0);
     EventRegisterEx(EVENT_ID_IME, reinterpret_cast<EVENTHANDLERFUNC>(CSimpleTop::OnIme), this, 1.0);
diff --git a/src/ui/CSimpleTop.hpp b/src/ui/CSimpleTop.hpp
index eaa6f7a..ea537aa 100644
--- a/src/ui/CSimpleTop.hpp
+++ b/src/ui/CSimpleTop.hpp
@@ -61,9 +61,13 @@ class CSimpleTop : public CLayoutFrame {
         int32_t (*m_mousePositionCallback)(CMouseEvent*) = nullptr;
         int32_t (*m_displaySizeCallback)(const CSizeEvent&) = nullptr;
 
+        // Virtual member functions
+        virtual ~CSimpleTop();
+
         // Member functions
         CSimpleTop();
         void CompressStrata(int32_t strata);
+        void DisableEvents();
         void EnableEvents();
         void HideFrame(CSimpleFrame* frame, int32_t a4);
         void MoveOrResizeFrame(const CMouseEvent& evt);