diff --git a/radio/src/gui/colorlcd/fullscreen_dialog.cpp b/radio/src/gui/colorlcd/fullscreen_dialog.cpp
index f700d1e69..b7f91a4f5 100644
--- a/radio/src/gui/colorlcd/fullscreen_dialog.cpp
+++ b/radio/src/gui/colorlcd/fullscreen_dialog.cpp
@@ -23,7 +23,7 @@
 #include "opentx.h"
 
 FullScreenDialog::FullScreenDialog(uint8_t type, std::string title, std::string message, std::string action, const std::function<void(void)> & confirmHandler):
-  FormGroup(&mainWindow, {0, 0, LCD_W, LCD_H}, OPAQUE),
+  FormGroup(MainWindow::instance(), {0, 0, LCD_W, LCD_H}, OPAQUE),
   type(type),
   title(std::move(title)),
   message(std::move(message)),
@@ -145,7 +145,7 @@ void FullScreenDialog::runForever()
     WDG_RESET();
 
     RTOS_WAIT_MS(20);
-    mainWindow.run(false);
+    MainWindow::instance()->run(false);
   }
 
   Window::deleteLater();
diff --git a/radio/src/gui/colorlcd/libopenui.h b/radio/src/gui/colorlcd/libopenui.h
index b9be46e9a..dff106be4 100644
--- a/radio/src/gui/colorlcd/libopenui.h
+++ b/radio/src/gui/colorlcd/libopenui.h
@@ -58,19 +58,19 @@
 
 inline MessageDialog * createPopupInformation(const char * message)
 {
-  return new MessageDialog(&mainWindow, "Message", message);
+  return new MessageDialog(MainWindow::instance(), "Message", message);
 }
 
 inline MessageDialog * createPopupWarning(const char * message)
 {
-  return new MessageDialog(&mainWindow, "Warning", message);
+  return new MessageDialog(MainWindow::instance(), "Warning", message);
 }
 
 inline void POPUP_INFORMATION(const char * message)
 {
   auto popup = createPopupInformation(message);
   while (popup->getParent()) {
-    mainWindow.run(false);
+    MainWindow::instance()->run(false);
   }
 }
 
@@ -81,7 +81,7 @@ inline void POPUP_WARNING(const char * message, const char * info = nullptr)
     popup->setInfoText(std::string(info));
   }
   while (popup->getParent()) {
-    mainWindow.run(false);
+    MainWindow::instance()->run(false);
   }
 }
 
diff --git a/radio/src/gui/colorlcd/page.cpp b/radio/src/gui/colorlcd/page.cpp
index 8f827f962..a042e9d80 100644
--- a/radio/src/gui/colorlcd/page.cpp
+++ b/radio/src/gui/colorlcd/page.cpp
@@ -42,7 +42,7 @@ void PageHeader::paint(BitmapBuffer * dc)
 }
 
 Page::Page(unsigned icon):
-  Window(&mainWindow, {0, 0, LCD_W, LCD_H}, OPAQUE),
+  Window(MainWindow::instance(), {0, 0, LCD_W, LCD_H}, OPAQUE),
   header(this, icon),
   body(this, { 0, MENU_HEADER_HEIGHT, LCD_W, LCD_H - MENU_HEADER_HEIGHT }, FORM_FORWARD_FOCUS)
 {
diff --git a/radio/src/gui/colorlcd/radio_sdmanager.cpp b/radio/src/gui/colorlcd/radio_sdmanager.cpp
index f92f60f7a..6a99ead4d 100644
--- a/radio/src/gui/colorlcd/radio_sdmanager.cpp
+++ b/radio/src/gui/colorlcd/radio_sdmanager.cpp
@@ -113,7 +113,7 @@ class FlashDialog: public FullScreenDialog
       device.flashFirmware(filename, [=](const char * title, const char * message, int count, int total) -> void {
           setMessage(message);
           progress.setValue(total > 0 ? count * 100 / total : 0);
-          mainWindow.run(false);
+          MainWindow::instance()->run(false);
       });
       deleteLater();
     }
diff --git a/radio/src/gui/colorlcd/tabsgroup.cpp b/radio/src/gui/colorlcd/tabsgroup.cpp
index d554e1a51..98134ca32 100644
--- a/radio/src/gui/colorlcd/tabsgroup.cpp
+++ b/radio/src/gui/colorlcd/tabsgroup.cpp
@@ -74,7 +74,7 @@ bool TabsCarousel::onTouchEnd(coord_t x, coord_t y)
 #endif
 
 TabsGroup::TabsGroup(uint8_t icon):
-  Window(&mainWindow, { 0, 0, LCD_W, LCD_H }, OPAQUE),
+  Window(MainWindow::instance(), { 0, 0, LCD_W, LCD_H }, OPAQUE),
   header(this, icon),
   body(this, { 0, MENU_BODY_TOP, LCD_W, MENU_BODY_HEIGHT }, FORM_FORWARD_FOCUS)
 {
diff --git a/radio/src/gui/colorlcd/view_main.cpp b/radio/src/gui/colorlcd/view_main.cpp
index 25b438b6c..66b913b98 100644
--- a/radio/src/gui/colorlcd/view_main.cpp
+++ b/radio/src/gui/colorlcd/view_main.cpp
@@ -59,7 +59,7 @@ int getMainViewsCount()
 ViewMain * ViewMain::instance = nullptr;
 
 ViewMain::ViewMain(bool icons):
-  FormWindow(&mainWindow, { 0, 0, LCD_W, LCD_H })
+  FormWindow(MainWindow::instance(), { 0, 0, LCD_W, LCD_H })
 {
   instance = this;
 
diff --git a/radio/src/main.cpp b/radio/src/main.cpp
index ebf0bad8d..7ea282eac 100644
--- a/radio/src/main.cpp
+++ b/radio/src/main.cpp
@@ -36,7 +36,7 @@ void openUsbMenu()
   static Menu * menu = nullptr;
   if (menu)
     return;
-  menu = new Menu(&mainWindow);
+  menu = new Menu(MainWindow::instance());
   menu->setCloseHandler([]() {
     menu = nullptr;
   });
@@ -329,7 +329,7 @@ void guiMain(event_t evt)
   bool screenshotRequested = (mainRequestFlags & (1u << REQUEST_SCREENSHOT));
 
 #if defined(LIBOPENUI)
-  mainWindow.run();
+  MainWindow::instance()->run();
 #else
   if (!refreshNeeded) {
     DEBUG_TIMER_START(debugTimerMenus);
diff --git a/radio/src/opentx.cpp b/radio/src/opentx.cpp
index e81f1b66d..ddbb224aa 100644
--- a/radio/src/opentx.cpp
+++ b/radio/src/opentx.cpp
@@ -1902,6 +1902,7 @@ void opentxInit()
   TRACE("opentxInit");
 
 #if defined(LIBOPENUI)
+  new MainWindow();
   new ViewMain();
 #elif defined(GUI)
   // TODO add a function for this (duplicated)
@@ -2260,7 +2261,7 @@ uint32_t pwrCheck()
   else {
 #if defined(COLORLCD)
     if (pwr_press_time != 0)
-      mainWindow.invalidate();
+      MainWindow::instance()->invalidate();
 #endif
     pwr_check_state = PWR_CHECK_ON;
     pwr_press_time = 0;
diff --git a/radio/src/thirdparty/libopenui b/radio/src/thirdparty/libopenui
index d7001e768..f84ff2649 160000
--- a/radio/src/thirdparty/libopenui
+++ b/radio/src/thirdparty/libopenui
@@ -1 +1 @@
-Subproject commit d7001e7687bee12a89032fa4c03c095510fe6fae
+Subproject commit f84ff264973379e537f6546b9b65d1f96100f8be