diff --git a/ewol/context/Context.cpp b/ewol/context/Context.cpp
index 6fa97098..0aabb04b 100644
--- a/ewol/context/Context.cpp
+++ b/ewol/context/Context.cpp
@@ -9,6 +9,7 @@
 #include <unistd.h>
 
 #include <etk/types.h>
+#include <etk/etk.h>
 
 #include <etk/tool.h>
 #include <etk/os/FSNode.h>
@@ -329,7 +330,14 @@ ewol::Context::Context(ewol::context::Application* _application, int32_t _argc,
 			m_displayFps=true;
 		} else if (    m_commandLine.get(iii) == "-h"
 		            || m_commandLine.get(iii) == "--help") {
-			// TODO ...
+			EWOL_PRINT("ewol - help : ");
+			EWOL_PRINT("    " << etk::getApplicationName() << " [options]");
+			EWOL_PRINT("        --ewol-fps:   Display the current fps of the display");
+			EWOL_PRINT("        -h/--help:    Display this help");
+			EWOL_PRINT("    example:");
+			EWOL_PRINT("        " << etk::getApplicationName() << " --ewol-fps");
+			// this is a global help system does not remove it
+			continue;
 		} else {
 			continue;
 		}
diff --git a/ewol/context/MacOs/Context.h b/ewol/context/MacOs/Context.h
index e7a5c474..3a62c5c2 100644
--- a/ewol/context/MacOs/Context.h
+++ b/ewol/context/MacOs/Context.h
@@ -24,6 +24,7 @@ namespace MacOs	{
 	void setKeyboard(ewol::key::Special _keyboardMode, int32_t _unichar, bool _isDown, bool _isAReapeateKey);
 	void setKeyboardMove(ewol::key::Special& _keyboardMode, enum ewol::key::keyboard _move, bool _isDown, bool _isAReapeateKey);
 	void stopRequested();
+	void setRedrawCallback(const std::function<void()>& _func);
 };
 
 #endif
\ No newline at end of file
diff --git a/ewol/context/MacOs/Context.mm b/ewol/context/MacOs/Context.mm
index 02d4c188..0a09c284 100644
--- a/ewol/context/MacOs/Context.mm
+++ b/ewol/context/MacOs/Context.mm
@@ -211,6 +211,13 @@ void MacOs::stopRequested() {
 	interface->MAC_Stop();
 }
 
+void MacOs::setRedrawCallback(const std::function<void()>& _func) {
+	if (interface == nullptr) {
+		return;
+	}
+	interface->getWidgetManager().setCallbackonRedrawNeeded(_func);
+}
+
 /**
  * @brief Main of the program
  * @param std IO
diff --git a/ewol/context/MacOs/Interface.mm b/ewol/context/MacOs/Interface.mm
index cade83e3..f8b6d0ba 100644
--- a/ewol/context/MacOs/Interface.mm
+++ b/ewol/context/MacOs/Interface.mm
@@ -5,7 +5,7 @@
  * 
  * @license APACHE v2.0 (see license file)
  */
-
+#include "Context.h"
 #import <Cocoa/Cocoa.h>
 #include "ewol/context/MacOs/Interface.h"
 
@@ -16,6 +16,11 @@
 
 id window = nil;
 
+void callbackSomeThingToDo() {
+	//EWOL_CRITICAL("ksdjlkqjsdlfkjsqdlkfjslqkdjflqksjdf");
+	[window UpdateScreenRequested];
+}
+
 int mm_main(int _argc, const char* _argv[]) {
 	[NSAutoreleasePool new];
 	
@@ -74,23 +79,16 @@ int mm_main(int _argc, const char* _argv[]) {
 	NSRect window_frame = [window frame];
 	
 	OpenGLView* view=[[OpenGLView alloc]initWithFrame:window_frame]; //NSMakeRect(0, 0, 800, 600)];
-    NSTrackingArea *track = [[NSTrackingArea alloc] initWithRect:window_frame options: NSTrackingMouseMoved | NSTrackingActiveWhenFirstResponder | NSTrackingActiveInKeyWindow
+	NSTrackingArea *track = [[NSTrackingArea alloc] initWithRect:window_frame options: NSTrackingMouseMoved | NSTrackingActiveWhenFirstResponder | NSTrackingActiveInKeyWindow
 														   owner:window userInfo:nil];
-    [view addTrackingArea:track];
+	[view addTrackingArea:track];
 	[window setContentView:view];
 	[view setAutoresizesSubviews:YES];
-	
-	// Override point for customization after application launch.
-	//[window addSubview:view];
-	//[window addChildWindow:view];
-	//[window makeKeyAndVisible];
-	
-	//[window setDelegate:view];
-	// return no error
 	return 0;
 }
 
 int mm_run(void) {
+	//MacOs::setRedrawCallback(std::bind(callbackSomeThingToDo));
 	[NSApp run];
 	EWOL_DEBUG("END of application");
 	// return no error
diff --git a/ewol/context/MacOs/OpenglView.h b/ewol/context/MacOs/OpenglView.h
index 8a57b9cd..1154bf76 100644
--- a/ewol/context/MacOs/OpenglView.h
+++ b/ewol/context/MacOs/OpenglView.h
@@ -13,7 +13,9 @@
 
 @interface OpenGLView : NSOpenGLView<NSWindowDelegate> {
     NSTimer* _refreshTimer;
+    bool _redraw;
 }
 - (void)prepareOpenGL;
 - (void)drawRect:(NSRect) bounds;
+- (void)UpdateScreenRequested;
 @end
diff --git a/ewol/context/MacOs/OpenglView.mm b/ewol/context/MacOs/OpenglView.mm
index cbf8469e..8fec1d55 100644
--- a/ewol/context/MacOs/OpenglView.mm
+++ b/ewol/context/MacOs/OpenglView.mm
@@ -30,13 +30,17 @@
 	ewol::Dimension::setPixelRatio(vec2((float)displayPixelSize.width/(float)displayPhysicalSize.width,
 	                                    (float)displayPixelSize.height/(float)displayPhysicalSize.height),
 	                                    ewol::Dimension::Millimeter);
-	//_refreshTimer=[ [ NSTimer scheduledTimerWithTimeInterval:0.017 target:self selector:@selector(animationTimerFired:) userInfo:nil repeats:YES ] retain ] ;
+	_refreshTimer=[ [ NSTimer scheduledTimerWithTimeInterval:0.017 target:self selector:@selector(animationTimerFired:) userInfo:nil repeats:YES ] retain ] ;
+	_redraw = true;
 	
 }
+- (void)UpdateScreenRequested {
+	_redraw = true;
+}
 
 -(void) drawRect: (NSRect) bounds {
 	if ( ! _refreshTimer ) {
-		//_refreshTimer=[ [ NSTimer scheduledTimerWithTimeInterval:0.017 target:self selector:@selector(animationTimerFired:) userInfo:nil repeats:YES ] retain ] ;
+		_refreshTimer=[ [ NSTimer scheduledTimerWithTimeInterval:0.017 target:self selector:@selector(animationTimerFired:) userInfo:nil repeats:YES ] retain ] ;
 		EWOL_WARNING("create timer ... ");
 	}
 	MacOs::draw(false);
@@ -46,8 +50,11 @@
  * Service the animation timer.
  */
 - (void) animationTimerFired: (NSTimer *) timer {
-	[self setNeedsDisplay:YES];
-	EWOL_WARNING("view refresh ..." );
+	if (_redraw == true) {
+		//_redraw = false;
+		[self setNeedsDisplay:YES];
+		//EWOL_WARNING("view refresh ..." );
+	}
 }
 
 -(void)reshape {
diff --git a/ewol/context/MacOs/Windows.h b/ewol/context/MacOs/Windows.h
index aacf94ae..6ea8de69 100644
--- a/ewol/context/MacOs/Windows.h
+++ b/ewol/context/MacOs/Windows.h
@@ -7,9 +7,10 @@
  */
 
 #import <Cocoa/Cocoa.h>
+#import <ewol/context/MacOs/OpenglView.h>
 
 @interface EwolMainWindows : NSWindow {
-	
+	OpenGLView* _view;
 }
 + (id)alloc;
 - (id)init;
@@ -32,6 +33,7 @@
 - (void)keyDown:(NSEvent *)theEvent;
 - (void)flagsChanged:(NSEvent *)theEvent;
 - (void)closeRequestEwol;
+- (void)UpdateScreenRequested;
 @end
 
 
diff --git a/ewol/context/MacOs/Windows.mm b/ewol/context/MacOs/Windows.mm
index c0605fe9..dd4e2183 100644
--- a/ewol/context/MacOs/Windows.mm
+++ b/ewol/context/MacOs/Windows.mm
@@ -8,7 +8,6 @@
 
 
 #import <ewol/context/MacOs/Windows.h>
-#import <ewol/context/MacOs/OpenglView.h>
 #include <ewol/context/MacOS/Context.h>
 #include <ewol/key/key.h>
 
@@ -52,11 +51,11 @@
 	NSRect window_frame = [windowsID frame];
 	EWOL_DEBUG("ALLOCATE ...");
 	
-	OpenGLView* view=[[OpenGLView alloc]initWithFrame:window_frame]; //NSMakeRect(0, 0, 800, 600)];
+	_view=[[OpenGLView alloc]initWithFrame:window_frame]; //NSMakeRect(0, 0, 800, 600)];
 	EWOL_DEBUG("ALLOCATE ...");
-	[windowsID setContentView:view];
+	[windowsID setContentView:_view];
 	EWOL_DEBUG("ALLOCATE ...");
-	[view setAutoresizesSubviews:YES];
+	[_view setAutoresizesSubviews:YES];
 	EWOL_DEBUG("ALLOCATE ...");
 	
 	// Override point for customization after application launch.
@@ -79,7 +78,6 @@
 + (void)performClose:(id)sender {
 	EWOL_ERROR("perform close ...");
 }
-					  
 
 static ewol::key::Special guiKeyBoardMode;
 
@@ -436,6 +434,9 @@ static ewol::key::Special guiKeyBoardMode;
 	MacOs::stopRequested();
 }
 
+- (void)UpdateScreenRequested {
+	[_view UpdateScreenRequested];
+}
 @end
 
 
diff --git a/ewol/widget/Manager.cpp b/ewol/widget/Manager.cpp
index dbd45161..ead8e708 100644
--- a/ewol/widget/Manager.cpp
+++ b/ewol/widget/Manager.cpp
@@ -157,48 +157,18 @@ void ewol::widget::Manager::focusRemoveIfRemove(const std::shared_ptr<ewol::Widg
 	}
 }
 
-/*
-void ewol::widget::Manager::periodicCall(int64_t _localTime) {
-	int64_t previousTime = m_lastPeriodicCallTime;
-	m_lastPeriodicCallTime = _localTime;
-	if (m_listOfPeriodicWidget.size() <= 0) {
-		return;
-	}
-	float deltaTime = (float)(_localTime - previousTime)/1000000.0;
-	
-	ewol::event::Time myTime(_localTime, m_applWakeUpTime, deltaTime, deltaTime);
-	
-	EWOL_VERBOSE("periodic : " << _localTime);
-	for (int32_t iii=m_listOfPeriodicWidget.size()-1; iii >= 0 ; iii--) {
-		auto tmpWidget = m_listOfPeriodicWidget[iii].lock();
-		if (nullptr != tmpWidget) {
-			int64_t deltaTimeCallUser = tmpWidget->systemGetCallDeltaTime();
-			if (deltaTimeCallUser <= 0) {
-				myTime.setDeltaCall(deltaTime);
-				EWOL_VERBOSE("[" << iii << "] periodic : " << myTime);
-				tmpWidget->systemSetLastCallTime(_localTime);
-				tmpWidget->periodicCall(myTime);
-			} else {
-				int64_t lastCallTime = tmpWidget->systemGetLastCallTime();
-				if (lastCallTime == 0) {
-					lastCallTime = _localTime;
-				}
-				float deltaLocalTime = (float)(_localTime-lastCallTime)/1000000.0;;
-				if (deltaLocalTime >=  lastCallTime) {
-					myTime.setDeltaCall(deltaLocalTime);
-					EWOL_VERBOSE("[" << iii << "] periodic : " << myTime);
-					tmpWidget->systemSetLastCallTime(_localTime);
-					tmpWidget->periodicCall(myTime);
-				}
-			}
-		}
-	}
+void ewol::widget::Manager::setCallbackonRedrawNeeded(const std::function<void()>& _func) {
+	m_funcRedrawNeeded = _func;
 }
-*/
-
 
 void ewol::widget::Manager::markDrawingIsNeeded() {
+	if (m_haveRedraw == true) {
+		return;
+	}
 	m_haveRedraw = true;
+	if (m_funcRedrawNeeded != nullptr) {
+		m_funcRedrawNeeded();
+	}
 }
 
 bool ewol::widget::Manager::isDrawingNeeded() {
diff --git a/ewol/widget/Manager.h b/ewol/widget/Manager.h
index f3bcea8b..c839c921 100644
--- a/ewol/widget/Manager.h
+++ b/ewol/widget/Manager.h
@@ -36,9 +36,12 @@ namespace ewol {
 				void focusRelease(); // release focus from the current widget to the default
 				std::shared_ptr<ewol::Widget> focusGet();
 				void focusRemoveIfRemove(const std::shared_ptr<ewol::Widget>& _newWidget);
-				
+			private:
+				std::function<void()> m_funcRedrawNeeded;
+			public:
 				void markDrawingIsNeeded();
 				bool isDrawingNeeded();
+				void setCallbackonRedrawNeeded(const std::function<void()>& _func);
 				
 				// element that generate the list of elements
 				void addWidgetCreator(const std::string& _name, creator_tf _pointer);