diff --git a/qtacrylicwidget.cpp b/qtacrylicwidget.cpp
index fddf3c0..812e4e5 100644
--- a/qtacrylicwidget.cpp
+++ b/qtacrylicwidget.cpp
@@ -143,7 +143,9 @@ void QtAcrylicWidget::setAcrylicEnabled(const bool value)
 {
     if (m_acrylicEnabled != value) {
         m_acrylicEnabled = value;
-        Utilities::setBlurEffectEnabled(windowHandle(), m_acrylicEnabled);
+        if (m_inited) {
+            Utilities::setBlurEffectEnabled(windowHandle(), m_acrylicEnabled);
+        }
         setAutoFillBackground(!m_acrylicEnabled);
         setAttribute(Qt::WA_NoSystemBackground, m_acrylicEnabled);
         setAttribute(Qt::WA_OpaquePaintEvent, m_acrylicEnabled);
@@ -156,25 +158,25 @@ void QtAcrylicWidget::setAcrylicEnabled(const bool value)
 void QtAcrylicWidget::showEvent(QShowEvent *event)
 {
     QWidget::showEvent(event);
-    static bool inited = false;
-    if (!inited) {
+    if (!m_inited) {
         FramelessWindowsManager::addWindow(windowHandle());
         m_acrylicHelper.install(windowHandle());
         m_acrylicHelper.updateAcrylicBrush(tintColor());
         connect(&m_acrylicHelper, &QtAcrylicEffectHelper::needsRepaint, this, qOverload<>(&QtAcrylicWidget::update));
         setAcrylicEnabled(true);
-        inited = true;
+        m_inited = true;
     }
 }
 
 void QtAcrylicWidget::paintEvent(QPaintEvent *event)
 {
     QPainter painter(this);
+    const QRect rect = {0, 0, width(), height()};
     if (acrylicEnabled()) {
-        m_acrylicHelper.paintWindowBackground(&painter, QRect{0, 0, width(), height()});
+        m_acrylicHelper.paintWindowBackground(&painter, rect);
     }
     if (frameVisible()) {
-        m_acrylicHelper.paintWindowFrame(&painter);
+        m_acrylicHelper.paintWindowFrame(&painter, rect);
     }
     QWidget::paintEvent(event);
 }
diff --git a/qtacrylicwidget.h b/qtacrylicwidget.h
index ca56e92..9849f59 100644
--- a/qtacrylicwidget.h
+++ b/qtacrylicwidget.h
@@ -82,4 +82,5 @@ private:
     QtAcrylicEffectHelper m_acrylicHelper;
     bool m_frameVisible = true;
     bool m_acrylicEnabled = false;
+    bool m_inited = false;
 };
diff --git a/utilities.h b/utilities.h
index db3e86b..10df702 100644
--- a/utilities.h
+++ b/utilities.h
@@ -98,6 +98,8 @@ FRAMELESSHELPER_EXPORT void updateQtFrameMargins(QWindow *window, const bool ena
 FRAMELESSHELPER_EXPORT quint32 getWindowDpi(const QWindow *window);
 FRAMELESSHELPER_EXPORT QMargins getWindowNativeFrameMargins(const QWindow *window);
 FRAMELESSHELPER_EXPORT QColor getNativeWindowFrameColor(const bool isActive = true);
+
+FRAMELESSHELPER_EXPORT void displaySystemMenu(const QWindow *window, const QPoint pos = {});
 #endif
 
 }
diff --git a/utilities_win32.cpp b/utilities_win32.cpp
index abb9e52..9b1700e 100644
--- a/utilities_win32.cpp
+++ b/utilities_win32.cpp
@@ -713,3 +713,72 @@ bool Utilities::shouldUseTraditionalBlur()
     }
     return false;
 }
+
+void Utilities::displaySystemMenu(const QWindow *window, const QPoint pos)
+{
+    Q_ASSERT(window);
+    if (!window) {
+        return;
+    }
+    const auto hwnd = reinterpret_cast<HWND>(window->winId());
+    Q_ASSERT(hwnd);
+    if (!hwnd) {
+        return;
+    }
+    const HMENU hMenu = GetSystemMenu(hwnd, FALSE);
+    if (!hMenu) {
+        qWarning() << "Failed to acquire the system menu.";
+        return;
+    }
+    MENUITEMINFOW mii;
+    SecureZeroMemory(&mii, sizeof(mii));
+    mii.cbSize = sizeof(mii);
+    mii.fMask = MIIM_STATE;
+    mii.fType = 0;
+    mii.fState = MF_ENABLED;
+    SetMenuItemInfoW(hMenu, SC_RESTORE, FALSE, &mii);
+    SetMenuItemInfoW(hMenu, SC_SIZE, FALSE, &mii);
+    SetMenuItemInfoW(hMenu, SC_MOVE, FALSE, &mii);
+    SetMenuItemInfoW(hMenu, SC_MAXIMIZE, FALSE, &mii);
+    SetMenuItemInfoW(hMenu, SC_MINIMIZE, FALSE, &mii);
+    mii.fState = MF_GRAYED;
+    const auto isMin = [window]{
+        return (window->windowState() == Qt::WindowMinimized);
+    }();
+    const auto isMax = [window]{
+        return (window->windowState() == Qt::WindowMaximized);
+    }();
+    const auto isFull = [window]{
+        return (window->windowState() == Qt::WindowFullScreen);
+    }();
+    const bool isNormal = !isMin && !isMax && !isFull;
+    const auto isFix = [window]{
+        if (window->flags().testFlag(Qt::MSWindowsFixedSizeDialogHint)) {
+            return true;
+        }
+        const QSize minSize = window->minimumSize();
+        const QSize maxSize = window->maximumSize();
+        if (!minSize.isEmpty() && !maxSize.isEmpty() && (minSize == maxSize)) {
+            return true;
+        }
+        return false;
+    }();
+    if (isFix || isMax || isFull) {
+        SetMenuItemInfoW(hMenu, SC_SIZE, FALSE, &mii);
+        SetMenuItemInfoW(hMenu, SC_MAXIMIZE, FALSE, &mii);
+    }
+    if (isFix || isFull || isNormal) {
+        SetMenuItemInfoW(hMenu, SC_RESTORE, FALSE, &mii);
+    }
+    if (isMax || isFull) {
+        SetMenuItemInfoW(hMenu, SC_MOVE, FALSE, &mii);
+    }
+    if (isMin) {
+        SetMenuItemInfoW(hMenu, SC_MINIMIZE, FALSE, &mii);
+    }
+    const QPoint point = pos.isNull() ? QCursor::pos(window->screen()) : pos;
+    const LPARAM cmd = TrackPopupMenu(hMenu, (TPM_LEFTBUTTON | TPM_RIGHTBUTTON | TPM_RETURNCMD | TPM_TOPALIGN | TPM_LEFTALIGN), point.x(), point.y(), 0, hwnd, nullptr);
+    if (cmd) {
+        PostMessageW(hwnd, WM_SYSCOMMAND, cmd, 0);
+    }
+}