diff --git a/apps/graph/app.cpp b/apps/graph/app.cpp
index 3611dd320..734ba72e7 100644
--- a/apps/graph/app.cpp
+++ b/apps/graph/app.cpp
@@ -10,8 +10,8 @@ App::App(::Context * context) :
   m_evaluateContext(EvaluateContext(context)),
   m_listController(ListController(nullptr, &m_functionStore)),
   m_listStackViewController(StackViewController(&m_tabViewController, &m_listController)),
-  m_graphController(GraphController(nullptr, &m_functionStore, &m_evaluateContext)),
-  m_valuesController(nullptr, &m_functionStore, &m_evaluateContext),
+  m_graphController(GraphController(nullptr, &m_functionStore)),
+  m_valuesController(nullptr, &m_functionStore),
   m_valuesStackViewController(StackViewController(&m_tabViewController, &m_valuesController)),
   m_tabViewController(&m_inputViewController, &m_listStackViewController, &m_graphController, &m_valuesStackViewController),
   m_inputViewController(&m_modalViewController, &m_tabViewController, this)
@@ -26,4 +26,8 @@ Context * App::globalContext() {
   return m_globalContext;
 }
 
+Context * App::evaluateContext() {
+  return &m_evaluateContext;
+}
+
 }
diff --git a/apps/graph/app.h b/apps/graph/app.h
index a0b4b462e..3dda36a45 100644
--- a/apps/graph/app.h
+++ b/apps/graph/app.h
@@ -16,6 +16,7 @@ public:
   App(::Context * context);
   InputViewController * inputViewController();
   Context * globalContext();
+  Context * evaluateContext();
 private:
   FunctionStore m_functionStore;
   Context * m_globalContext;
diff --git a/apps/graph/graph/graph_controller.cpp b/apps/graph/graph/graph_controller.cpp
index 20f74d949..aca0000dd 100644
--- a/apps/graph/graph/graph_controller.cpp
+++ b/apps/graph/graph/graph_controller.cpp
@@ -1,17 +1,26 @@
 #include "graph_controller.h"
+#include "../app.h"
 #include <assert.h>
 
 namespace Graph {
 
-GraphController::GraphController(Responder * parentResponder, FunctionStore * functionStore, EvaluateContext * evaluateContext) :
+GraphController::GraphController(Responder * parentResponder, FunctionStore * functionStore) :
   HeaderViewController(parentResponder, &m_view),
-  m_view(GraphView(functionStore, evaluateContext)),
+  m_view(GraphView(functionStore)),
   m_headerSelected(false),
   m_windowButton(Button(this, "Fenetre", Invocation([](void * context, void * sender) {}, this))),
   m_displayButton(this, "Affichage", Invocation([](void * context, void * sender) {}, this))
 {
 }
 
+View * GraphController::view() {
+  if (m_view.context() == nullptr) {
+    App * graphApp = (Graph::App *)app();
+    m_view.setContext(graphApp->evaluateContext());
+  }
+  return HeaderViewController::view();
+}
+
 const char * GraphController::title() const {
   return "Graphique";
 }
diff --git a/apps/graph/graph/graph_controller.h b/apps/graph/graph/graph_controller.h
index 5a86e2b16..ccfd74203 100644
--- a/apps/graph/graph/graph_controller.h
+++ b/apps/graph/graph/graph_controller.h
@@ -4,14 +4,13 @@
 #include <escher.h>
 #include "graph_view.h"
 #include "../function_store.h"
-#include "../evaluate_context.h"
 
 namespace Graph {
 class GraphController : public HeaderViewController {
 public:
-  GraphController(Responder * parentResponder, FunctionStore * functionStore, EvaluateContext * evaluateContext);
+  GraphController(Responder * parentResponder, FunctionStore * functionStore);
   const char * title() const override;
-
+  View * view() override;
   bool handleEvent(Ion::Events::Event event) override;
   void didBecomeFirstResponder() override;
 
diff --git a/apps/graph/graph/graph_view.cpp b/apps/graph/graph/graph_view.cpp
index 99d550ddc..5ee5ba5b8 100644
--- a/apps/graph/graph/graph_view.cpp
+++ b/apps/graph/graph/graph_view.cpp
@@ -9,7 +9,7 @@ constexpr KDColor kSecondaryGridColor = KDColor(0xEEEEEE);
 constexpr int kNumberOfMainGridLines = 5;
 constexpr int kNumberOfSecondaryGridLines = 4;
 
-GraphView::GraphView(FunctionStore * functionStore, EvaluateContext * evaluateContext) :
+GraphView::GraphView(FunctionStore * functionStore) :
 #if GRAPH_VIEW_IS_TILED
   TiledView(),
 #else
@@ -22,7 +22,7 @@ GraphView::GraphView(FunctionStore * functionStore, EvaluateContext * evaluateCo
   m_yMin(-2.0f),
   m_yMax(2.0f),
   m_functionStore(functionStore),
-  m_evaluateContext(evaluateContext)
+  m_evaluateContext(nullptr)
 {
 }
 
@@ -34,6 +34,14 @@ View * GraphView::subviewAtIndex(int index) {
   return &m_cursorView;
 }
 
+void GraphView::setContext(Context * context) {
+  m_evaluateContext = (EvaluateContext *)context;
+}
+
+Context * GraphView::context() const {
+  return m_evaluateContext;
+}
+
 void GraphView::moveCursorRight() {
   KDPoint offset = KDPoint(2,0);
   m_cursorPosition = m_cursorPosition.translatedBy(offset);
diff --git a/apps/graph/graph/graph_view.h b/apps/graph/graph/graph_view.h
index 33c4a36da..429ece581 100644
--- a/apps/graph/graph/graph_view.h
+++ b/apps/graph/graph/graph_view.h
@@ -18,7 +18,7 @@ class GraphView : public
 #endif
 {
 public:
-  GraphView(FunctionStore * functionStore, EvaluateContext * evaluateContext);
+  GraphView(FunctionStore * functionStore);
 
 #if GRAPH_VIEW_IS_TILED
   KDColor * tile() const override;
@@ -30,6 +30,8 @@ public:
 
 //  void drawRect(KDRect rect) const override;
   void moveCursorRight();
+  void setContext(Context * evaluateContext);
+  Context * context() const;
 private:
   int numberOfSubviews() const override;
   View * subviewAtIndex(int index) override;
diff --git a/apps/graph/values/values_controller.cpp b/apps/graph/values/values_controller.cpp
index a6ff6779b..b90742ae2 100644
--- a/apps/graph/values/values_controller.cpp
+++ b/apps/graph/values/values_controller.cpp
@@ -47,11 +47,10 @@ ValuesController::ContentView::TableState ValuesController::ContentView::tableSt
 
 /* Value Controller */
 
-ValuesController::ValuesController(Responder * parentResponder, FunctionStore * functionStore, EvaluateContext * evaluateContext) :
+ValuesController::ValuesController(Responder * parentResponder, FunctionStore * functionStore) :
   HeaderViewController(parentResponder, &m_contentView),
   m_selectableTableView(SelectableTableView(this, this, k_topMargin, k_rightMargin, k_bottomMargin, k_leftMargin)),
   m_functionStore(functionStore),
-  m_evaluateContext(evaluateContext),
   m_parameterController(ValuesParameterController(this, &m_interval)),
   m_abscissaParameterController(AbscissaParameterController(this, &m_parameterController)),
   m_functionParameterController(FunctionParameterController(this)),
@@ -384,10 +383,11 @@ void ValuesController::willDisplayCellAtLocation(TableViewCell * cell, int i, in
   }
   Function * function = functionAtColumn(i);
   float x = m_interval.element(j-1);
+  App * graphApp = (Graph::App *)app();
   if (isDerivativeColumn(i)) {
-    Float(function->approximateDerivative(x, m_evaluateContext)).convertFloatToText(buffer, Constant::FloatBufferSizeInScientificMode, Constant::NumberOfDigitsInMantissaForDerivativeNumberInScientificMode);
+    Float(function->approximateDerivative(x, (EvaluateContext *)graphApp->evaluateContext())).convertFloatToText(buffer, Constant::FloatBufferSizeInScientificMode, Constant::NumberOfDigitsInMantissaForDerivativeNumberInScientificMode);
   } else {
-    Float(function->evaluateAtAbscissa(x, m_evaluateContext)).convertFloatToText(buffer, Constant::FloatBufferSizeInScientificMode, Constant::NumberOfDigitsInMantissaInScientificMode);
+    Float(function->evaluateAtAbscissa(x, (EvaluateContext *)graphApp->evaluateContext())).convertFloatToText(buffer, Constant::FloatBufferSizeInScientificMode, Constant::NumberOfDigitsInMantissaInScientificMode);
   }
   myValueCell->setText(buffer);
 }
diff --git a/apps/graph/values/values_controller.h b/apps/graph/values/values_controller.h
index 8e85a7990..79760e5a6 100644
--- a/apps/graph/values/values_controller.h
+++ b/apps/graph/values/values_controller.h
@@ -3,7 +3,6 @@
 
 #include <escher.h>
 #include "../function_store.h"
-#include "../evaluate_context.h"
 #include "../function_title_cell.h"
 #include "value_cell.h"
 #include "title_cell.h"
@@ -17,7 +16,7 @@ namespace Graph {
 
 class ValuesController : public HeaderViewController, public TableViewDataSource {
 public:
-  ValuesController(Responder * parentResponder, FunctionStore * functionStore, EvaluateContext * evaluateContext);
+  ValuesController(Responder * parentResponder, FunctionStore * functionStore);
 
   int activeRow();
   int activeColumn();
@@ -88,7 +87,6 @@ private:
   FunctionTitleCell m_functionTitleCells[k_maxNumberOfFunctions];
   ValueCell m_floatCells[k_maxNumberOfCells];
   FunctionStore * m_functionStore;
-  EvaluateContext * m_evaluateContext;
   Interval m_interval;
   ValuesParameterController m_parameterController;
   AbscissaParameterController m_abscissaParameterController;