diff -r 69e8e0936858 -r b9dc9cdfa23a ui/wpf/UIwrapper/UIwrapper/toolkit.cpp
--- a/ui/wpf/UIwrapper/UIwrapper/toolkit.cpp	Sun Jan 22 11:48:50 2017 +0100
+++ b/ui/wpf/UIwrapper/UIwrapper/toolkit.cpp	Sun Jan 22 17:23:20 2017 +0100
@@ -7,6 +7,39 @@
 
 #using "UIcore.dll"
 
+static UIcallback startup_func;
+void              *startup_data;
+static UIcallback open_func;
+void              *open_data;
+static UIcallback exit_func;
+void              *exit_data;
+
+public ref class AppCallbacks : public UI::IApplicationCallbacks {
+public:
+	UIcallback startupFunc = NULL;
+	void       *startupData = NULL;
+	UIcallback openFunc = NULL;
+	void       *openData = NULL;
+	UIcallback exitFunc = NULL;
+	void       *exitData = NULL;
+
+	virtual void __clrcall OnStartup() {
+		if (startupFunc) {
+			startupFunc(NULL, startupData);
+		}
+	}
+	virtual void __clrcall OnOpen() {
+		if (openFunc) {
+			openFunc(NULL, openData);
+		}
+	}
+	virtual void __clrcall OnExit() {
+		if (exitFunc) {
+			exitFunc(NULL, exitData);
+		}
+	}
+};
+
 
 void* ObjectToPtr(Object ^obj) {
 	GCHandle handle = GCHandle::Alloc(obj);
@@ -58,8 +91,34 @@
 	app->Name = gcnew String(appname);
 }
 
+UI_EXPORT void __stdcall UIonstartup(UIcallback f, void *userdata) {
+	startup_func = f;
+	startup_data = userdata;
+}
+
+UI_EXPORT void __stdcall UIonopen(UIcallback f, void *userdata) {
+	open_func = f;
+	open_data = userdata;
+}
+
+UI_EXPORT void __stdcall UIonexit(UIcallback f, void *userdata) {
+	exit_func = f;
+	exit_data = userdata;
+}
+
 UI_EXPORT void __stdcall UImain() {
-	Thread ^thread = UI::Application::GetInstance()->Start();
+	AppCallbacks ^ac = gcnew AppCallbacks();
+	ac->startupFunc = startup_func;
+	ac->startupData = startup_data;
+	ac->openFunc = open_func;
+	ac->openData = open_data;
+	ac->exitFunc = exit_func;
+	ac->exitData = exit_data;
+	
+	UI::Application ^app = UI::Application::GetInstance();
+	app->callbacks = ac;
+
+	Thread ^thread = app->Start();
 	thread->Join();
 }