Index: ps/trunk/source/gui/CGUI.h
===================================================================
--- ps/trunk/source/gui/CGUI.h
+++ ps/trunk/source/gui/CGUI.h
@@ -26,6 +26,7 @@
 #include "gui/GUITooltip.h"
 #include "gui/SettingTypes/CGUIColor.h"
 #include "gui/SGUIIcon.h"
+#include "gui/SGUIMessage.h"
 #include "gui/SGUIStyle.h"
 #include "lib/input.h"
 #include "maths/Rect.h"
@@ -288,6 +289,11 @@
 	void SetFocusedObject(IGUIObject* pObject);
 
 	/**
+	 * Alert the focussed object of this GUIPage that the focus of the page has changed.
+	 */
+	void SendFocusMessage(EGUIMessageType msg);
+
+	/**
 	 * Reads a string value and modifies the given value of type T if successful.
 	 * Does not change the value upon conversion failure.
 	 *
Index: ps/trunk/source/gui/CGUI.cpp
===================================================================
--- ps/trunk/source/gui/CGUI.cpp
+++ ps/trunk/source/gui/CGUI.cpp
@@ -423,6 +423,15 @@
 	return CSize2D{static_cast<float>(g_xres) / g_VideoMode.GetScale(), static_cast<float>(g_yres) / g_VideoMode.GetScale() };
 }
 
+void CGUI::SendFocusMessage(EGUIMessageType msgType)
+{
+	if (m_FocusedObject)
+	{
+		SGUIMessage msg(msgType);
+		m_FocusedObject->HandleMessage(msg);
+	}
+}
+
 void CGUI::SetFocusedObject(IGUIObject* pObject)
 {
 	if (pObject == m_FocusedObject)
Index: ps/trunk/source/gui/GUIManager.cpp
===================================================================
--- ps/trunk/source/gui/GUIManager.cpp
+++ ps/trunk/source/gui/GUIManager.cpp
@@ -103,7 +103,12 @@
 		initDataClone = Script::WriteStructuredClone(rq, initData);
 	}
 
-	m_PageStack.clear();
+	if (!m_PageStack.empty())
+	{
+		// Make sure we unfocus anything on the current page.
+		m_PageStack.back().gui->SendFocusMessage(GUIM_LOST_FOCUS);
+		m_PageStack.clear();
+	}
 
 	PushPage(pageName, initDataClone, JS::UndefinedHandleValue);
 }
@@ -112,8 +117,13 @@
 {
 	// Store the callback handler in the current GUI page before opening the new one
 	if (!m_PageStack.empty() && !callbackFunction.isUndefined())
+	{
 		m_PageStack.back().SetCallbackFunction(*m_ScriptInterface, callbackFunction);
 
+		// Make sure we unfocus anything on the current page.
+		m_PageStack.back().gui->SendFocusMessage(GUIM_LOST_FOCUS);
+	}
+
 	// Push the page prior to loading its contents, because that may push
 	// another GUI page on init which should be pushed on top of this new page.
 	m_PageStack.emplace_back(pageName, initData);
@@ -128,8 +138,14 @@
 		return;
 	}
 
+	// Make sure we unfocus anything on the current page.
+	m_PageStack.back().gui->SendFocusMessage(GUIM_LOST_FOCUS);
+
 	m_PageStack.pop_back();
 	m_PageStack.back().PerformCallbackFunction(args);
+
+	// We return to a page where some object might have been focused.
+	m_PageStack.back().gui->SendFocusMessage(GUIM_GOT_FOCUS);
 }
 
 CGUIManager::SGUIPage::SGUIPage(const CStrW& pageName, const Script::StructuredClone initData)