Index: binaries/data/mods/_test.gui/gui/regainFocus/page_emptyPage.xml
===================================================================
--- /dev/null
+++ binaries/data/mods/_test.gui/gui/regainFocus/page_emptyPage.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<page>
+	<include>common/styles.xml</include>
+</page>
Index: binaries/data/mods/_test.gui/gui/regainFocus/page_pushWithPopOnInit.xml
===================================================================
--- /dev/null
+++ binaries/data/mods/_test.gui/gui/regainFocus/page_pushWithPopOnInit.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<page>
+	<include>common/styles.xml</include>
+	<include>regainFocus/pushWithPopOnInit.xml</include>
+</page>
Index: binaries/data/mods/_test.gui/gui/regainFocus/page_regainFocus.xml
===================================================================
--- /dev/null
+++ binaries/data/mods/_test.gui/gui/regainFocus/page_regainFocus.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<page>
+	<include>common/styles.xml</include>
+	<include>regainFocus/regainFocus.xml</include>
+</page>
Index: binaries/data/mods/_test.gui/gui/regainFocus/pushWithPopOnInit.js
===================================================================
--- /dev/null
+++ binaries/data/mods/_test.gui/gui/regainFocus/pushWithPopOnInit.js
@@ -0,0 +1 @@
+Engine.PushGuiPage("regainFocus/page_emptyPage.xml", {}, () => Engine.PopGuiPage());
Index: binaries/data/mods/_test.gui/gui/regainFocus/pushWithPopOnInit.xml
===================================================================
--- /dev/null
+++ binaries/data/mods/_test.gui/gui/regainFocus/pushWithPopOnInit.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<objects>
+	<script file="gui/regainFocus/pushWithPopOnInit.js"/>
+</objects>
Index: binaries/data/mods/_test.gui/gui/regainFocus/regainFocus.js
===================================================================
--- /dev/null
+++ binaries/data/mods/_test.gui/gui/regainFocus/regainFocus.js
@@ -0,0 +1,7 @@
+var receivedEvents = 0;
+var obj1 = Engine.GetGUIObjectByName("obj1");
+
+obj1.onPageRegainedFocus = () => { ++receivedEvents; };
+obj1.onTick = () => {
+	Engine.PushGuiPage("regainFocus/page_emptyPage.xml", {}, () => Engine.PushGuiPage("regainFocus/page_emptyPage.xml"));
+};
Index: binaries/data/mods/_test.gui/gui/regainFocus/regainFocus.xml
===================================================================
--- /dev/null
+++ binaries/data/mods/_test.gui/gui/regainFocus/regainFocus.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<objects>
+	<object name="obj1"/>
+
+	<script file="gui/regainFocus/regainFocus.js"/>
+</objects>
Index: binaries/data/mods/public/gui/common/OverlayCounterManager.js
===================================================================
--- binaries/data/mods/public/gui/common/OverlayCounterManager.js
+++ binaries/data/mods/public/gui/common/OverlayCounterManager.js
@@ -15,6 +15,7 @@
 		this.resizeHandlers = [];
 		this.lastHeight = undefined;
 		this.initSize = this.dataCounter.size;
+		this.hideOverlay = false;
 
 		for (let name of this.availableCounterNames())
 		{
@@ -28,6 +29,13 @@
 		}
 
 		this.dataCounter.onTick = this.onTick.bind(this);
+		this.dataCounter.onPageRegainedFocus = () => this.hide(false);
+	}
+
+	hide(hide)
+	{
+		this.hideOverlay = hide;
+		this.rebuildOverlay();
 	}
 
 	/**
@@ -79,6 +87,17 @@
 
 		this.lastTick = now;
 
+		this.rebuildOverlay();
+	}
+
+	rebuildOverlay()
+	{
+		if (this.hideOverlay)
+		{
+			this.dataCounter.hidden = true;
+			return;
+		}
+
 		let lineCount = 0;
 		let txt = "";
 
Index: binaries/data/mods/public/gui/gamesetup/Pages/GameSetupPage/Panels/Buttons/LobbyButton.js
===================================================================
--- binaries/data/mods/public/gui/gamesetup/Pages/GameSetupPage/Panels/Buttons/LobbyButton.js
+++ binaries/data/mods/public/gui/gamesetup/Pages/GameSetupPage/Panels/Buttons/LobbyButton.js
@@ -10,8 +10,11 @@
 
 	onPress()
 	{
-		if (Engine.HasXmppClient())
-			Engine.PushGuiPage("page_lobby.xml", { "dialog": true });
+		if (!Engine.HasXmppClient())
+			return;
+
+		g_OverlayCounterManager.hide(true);
+		Engine.PushGuiPage("page_lobby.xml", { "dialog": true });
 	}
 }
 
Index: binaries/data/mods/public/gui/pregame/MainMenuItems.js
===================================================================
--- binaries/data/mods/public/gui/pregame/MainMenuItems.js
+++ binaries/data/mods/public/gui/pregame/MainMenuItems.js
@@ -7,6 +7,7 @@
 				"caption": translate("Manual"),
 				"tooltip": translate("Open the 0 A.D. Game Manual."),
 				"onPress": () => {
+					g_OverlayCounterManager.hide(true);
 					Engine.PushGuiPage("page_manual.xml");
 				}
 			},
@@ -176,8 +177,10 @@
 				"enabled": () => !!Engine.StartXmppClient,
 				"hotkey": "lobby",
 				"onPress": () => {
-					 if (Engine.StartXmppClient)
-						 Engine.PushGuiPage("page_prelobby_entrance.xml");
+					if (!Engine.StartXmppClient)
+						return;
+					g_OverlayCounterManager.hide(true);
+					Engine.PushGuiPage("page_prelobby_entrance.xml");
 				}
 			},
 			{
@@ -203,6 +206,7 @@
 				"caption": translate("Options"),
 				"tooltip": translate("Adjust game settings."),
 				"onPress": () => {
+					g_OverlayCounterManager.hide(true);
 					Engine.PushGuiPage(
 						"page_options.xml",
 						{},
@@ -213,6 +217,7 @@
 				"caption": translate("Hotkeys"),
 				"tooltip": translate("Adjust hotkeys."),
 				"onPress": () => {
+					g_OverlayCounterManager.hide(true);
 					Engine.PushGuiPage("hotkeys/page_hotkeys.xml");
 				}
 			},
@@ -220,6 +225,7 @@
 				"caption": translate("Language"),
 				"tooltip": translate("Choose the language of the game."),
 				"onPress": () => {
+					g_OverlayCounterManager.hide(true);
 					Engine.PushGuiPage("page_locale.xml");
 				}
 			},
@@ -234,6 +240,7 @@
 				"caption": translate("Welcome Screen"),
 				"tooltip": translate("Show the Welcome Screen again. Useful if you hid it by mistake."),
 				"onPress": () => {
+					g_OverlayCounterManager.hide(true);
 					Engine.PushGuiPage("page_splashscreen.xml");
 				}
 			}
@@ -261,6 +268,7 @@
 		"caption": translate("Credits"),
 		"tooltip": translate("Show the 0 A.D. credits."),
 		"onPress": () => {
+			g_OverlayCounterManager.hide(true);
 			Engine.PushGuiPage("page_credits.xml");
 		}
 	},
Index: binaries/data/mods/public/gui/pregame/SplashscreenHandler.js
===================================================================
--- binaries/data/mods/public/gui/pregame/SplashscreenHandler.js
+++ binaries/data/mods/public/gui/pregame/SplashscreenHandler.js
@@ -32,6 +32,9 @@
 
 		if (Engine.ConfigDB_GetValue("user", "gui.splashscreen.enable") === "true" ||
 		    Engine.ConfigDB_GetValue("user", "gui.splashscreen.version") < Engine.GetFileMTime("gui/splashscreen/splashscreen.txt"))
+		{
+			g_OverlayCounterManager.hide(true);
 			Engine.PushGuiPage("page_splashscreen.xml", {});
+		}
 	}
 }
Index: binaries/data/mods/public/gui/prelobby/entrance/entrance.js
===================================================================
--- binaries/data/mods/public/gui/prelobby/entrance/entrance.js
+++ binaries/data/mods/public/gui/prelobby/entrance/entrance.js
@@ -6,11 +6,13 @@
 
 function loginButton()
 {
+	g_OverlayCounterManager.hide(true);
 	Engine.PushGuiPage("page_prelobby_login.xml");
 }
 
 function registerButton()
 {
+	g_OverlayCounterManager.hide(true);
 	Engine.PushGuiPage("page_prelobby_register.xml");
 }
 
Index: binaries/data/mods/public/gui/session/MenuButtons.js
===================================================================
--- binaries/data/mods/public/gui/session/MenuButtons.js
+++ binaries/data/mods/public/gui/session/MenuButtons.js
@@ -20,6 +20,7 @@
 	{
 		closeOpenDialogs();
 		this.pauseControl.implicitPause();
+		g_OverlayCounterManager.hide(true);
 		Engine.PushGuiPage("page_manual.xml", {}, resumeGame);
 	}
 };
@@ -99,7 +100,8 @@
 
 		closeOpenDialogs();
 		this.pauseControl.implicitPause();
-		 // Allows players to see their own summary.
+		g_OverlayCounterManager.hide(true);
+		// Allows players to see their own summary.
 		// If they have shared ally vision researched, they are able to see the summary of there allies too.
 		let simState = Engine.GuiInterfaceCall("GetExtendedSimulationState");
 		Engine.PushGuiPage(
@@ -149,6 +151,7 @@
 		if (!Engine.HasXmppClient())
 			return;
 		closeOpenDialogs();
+		g_OverlayCounterManager.hide(true);
 		Engine.PushGuiPage("page_lobby.xml", { "dialog": true });
 	}
 };
@@ -166,6 +169,7 @@
 	{
 		closeOpenDialogs();
 		this.pauseControl.implicitPause();
+		g_OverlayCounterManager.hide(true);
 
 		Engine.PushGuiPage(
 			"page_options.xml",
@@ -190,11 +194,9 @@
 	{
 		closeOpenDialogs();
 		this.pauseControl.implicitPause();
+		g_OverlayCounterManager.hide(true);
 
-		Engine.PushGuiPage(
-			"hotkeys/page_hotkeys.xml",
-			{},
-			() => { resumeGame(); });
+		Engine.PushGuiPage( "hotkeys/page_hotkeys.xml", {}, resumeGame);
 	}
 };
 
Index: source/gui/GUIManager.h
===================================================================
--- source/gui/GUIManager.h
+++ source/gui/GUIManager.h
@@ -161,6 +161,7 @@
 	};
 
 	const static CStr EventNameWindowResized;
+	const static CStr EventNamePageRegainedFocus;
 
 	std::shared_ptr<CGUI> top() const;
 
Index: source/gui/GUIManager.cpp
===================================================================
--- source/gui/GUIManager.cpp
+++ source/gui/GUIManager.cpp
@@ -34,6 +34,7 @@
 CGUIManager* g_GUI = nullptr;
 
 const CStr CGUIManager::EventNameWindowResized = "WindowResized";
+const CStr CGUIManager::EventNamePageRegainedFocus = "PageRegainedFocus";
 
 
 // General TODOs:
@@ -123,7 +124,14 @@
 	}
 
 	m_PageStack.pop_back();
+	// Save an immutable copy so page isn't invalidated by anything that happens in the callback function.
+	SGUIPage page = m_PageStack.back();
 	m_PageStack.back().PerformCallbackFunction(args);
+
+	// Only send the regained focus event if the page is still on the top.
+	// We can assume that pages are identifiable by their gui pointer.
+	if (page.gui == m_PageStack.back().gui)
+		m_PageStack.back().gui->SendEventToAll(EventNamePageRegainedFocus);
 }
 
 CGUIManager::SGUIPage::SGUIPage(const CStrW& pageName, const Script::StructuredClone initData)
Index: source/gui/tests/test_GuiManager.h
===================================================================
--- source/gui/tests/test_GuiManager.h
+++ source/gui/tests/test_GuiManager.h
@@ -197,4 +197,58 @@
 
 		UnloadHotkeys();
 	}
+	void test_PageRegainedFocusEvent()
+	{
+		// Load up a test page.
+		const ScriptInterface& scriptInterface = *(g_GUI->GetScriptInterface());
+		ScriptRequest rq(scriptInterface);
+		JS::RootedValue val(rq.cx);
+		Script::CreateObject(rq, &val);
+
+		Script::StructuredClone data = Script::WriteStructuredClone(rq, JS::NullHandleValue);
+		g_GUI->PushPage(L"regainFocus/page_regainFocus.xml", data, JS::UndefinedHandleValue);
+
+		const ScriptInterface& pageScriptInterface = *(g_GUI->GetActiveGUI()->GetScriptInterface());
+		ScriptRequest prq(pageScriptInterface);
+		JS::RootedValue global(prq.cx, prq.globalValue());
+
+		int receivedEvents = 0;
+		JS::RootedValue jsReceivedEvents(prq.cx);
+
+		// Just check if the initial values are correct.
+		Script::GetProperty(prq, global, "receivedEvents", &jsReceivedEvents);
+		Script::FromJSVal(prq, jsReceivedEvents, receivedEvents);
+		TS_ASSERT_EQUALS(receivedEvents, 0);
+
+		g_GUI->PushPage(L"regainFocus/page_emptyPage.xml", data, JS::UndefinedHandleValue);
+		g_GUI->PopPage(data);
+
+		// Regained focus once.
+		Script::GetProperty(prq, global, "receivedEvents", &jsReceivedEvents);
+		Script::FromJSVal(prq, jsReceivedEvents, receivedEvents);
+		TS_ASSERT_EQUALS(receivedEvents, 1);
+
+		// This page instantly pushes an empty page with a callback that pops another page again.
+		g_GUI->PushPage(L"regainFocus/page_pushWithPopOnInit.xml", data, JS::UndefinedHandleValue);
+
+		// Pop the empty page and trigger the callback.
+		g_GUI->PopPage(data);
+
+		// We are now back at the initial page and the event should have been triggered only once.
+		Script::GetProperty(prq, global, "receivedEvents", &jsReceivedEvents);
+		Script::FromJSVal(prq, jsReceivedEvents, receivedEvents);
+		TS_ASSERT_EQUALS(receivedEvents, 2);
+
+		// This triggers obj1 that will push an empty page with a callback that also pushes an empty page.
+		g_GUI->TickObjects();
+		// Pop the empty page and trigger the callback that pushes another empty page.
+		g_GUI->PopPage(data);
+		// Pop the newly pushed empty page.
+		g_GUI->PopPage(data);
+
+		// We are now back at the initial page and the callback should have been triggered only once.
+		Script::GetProperty(prq, global, "receivedEvents", &jsReceivedEvents);
+		Script::FromJSVal(prq, jsReceivedEvents, receivedEvents);
+		TS_ASSERT_EQUALS(receivedEvents, 3);
+	}
 };