diff --git a/apps/graph/Makefile b/apps/graph/Makefile
index f9e70f98e..8dedf6855 100644
--- a/apps/graph/Makefile
+++ b/apps/graph/Makefile
@@ -22,6 +22,7 @@ app_objs += $(addprefix apps/graph/,\
   graph/storage_calculation_parameter_controller.o\
   graph/storage_curve_parameter_controller.o\
   graph/storage_graph_controller.o\
+  graph/storage_graph_controller_helper.o\
   graph/storage_graph_view.o\
   graph/storage_intersection_graph_controller.o\
   graph/storage_tangent_graph_controller.o\
diff --git a/apps/graph/graph/storage_graph_controller.cpp b/apps/graph/graph/storage_graph_controller.cpp
index 29b2e7e67..7b5f81563 100644
--- a/apps/graph/graph/storage_graph_controller.cpp
+++ b/apps/graph/graph/storage_graph_controller.cpp
@@ -75,7 +75,7 @@ void StorageGraphController::reloadBannerView() {
 bool StorageGraphController::moveCursorHorizontally(int direction) {
   StorageCartesianFunction f = m_functionStore->activeFunctionAtIndex(indexFunctionSelectedByCursor());
   TextFieldDelegateApp * myApp = (TextFieldDelegateApp *)app();
-  return true; //TODO privateMoveCursorHorizontally(m_cursor, direction, m_graphRange, k_numberOfCursorStepsInGradUnit, &f, myApp, k_cursorTopMarginRatio, k_cursorRightMarginRatio, k_cursorBottomMarginRatio, k_cursorLeftMarginRatio);
+  return privateMoveCursorHorizontally(m_cursor, direction, m_graphRange, k_numberOfCursorStepsInGradUnit, &f, myApp, k_cursorTopMarginRatio, k_cursorRightMarginRatio, k_cursorBottomMarginRatio, k_cursorLeftMarginRatio);
 }
 
 InteractiveCurveViewRange * StorageGraphController::interactiveCurveViewRange() {
diff --git a/apps/graph/graph/storage_graph_controller.h b/apps/graph/graph/storage_graph_controller.h
index a21f10dd8..225f7c415 100644
--- a/apps/graph/graph/storage_graph_controller.h
+++ b/apps/graph/graph/storage_graph_controller.h
@@ -1,9 +1,9 @@
 #ifndef GRAPH_STORAGE_GRAPH_CONTROLLER_H
 #define GRAPH_STORAGE_GRAPH_CONTROLLER_H
 
-#include "graph_controller_helper.h"
 #include "banner_view.h"
 #include "storage_curve_parameter_controller.h"
+#include "storage_graph_controller_helper.h"
 #include "storage_graph_view.h"
 #include "../../shared/storage_function_graph_controller.h"
 #include "../../shared/curve_view_cursor.h"
@@ -13,7 +13,7 @@
 
 namespace Graph {
 
-class StorageGraphController : public Shared::StorageFunctionGraphController<StorageCartesianFunction>, public GraphControllerHelper {
+class StorageGraphController : public Shared::StorageFunctionGraphController<StorageCartesianFunction>, public StorageGraphControllerHelper {
 public:
   StorageGraphController(Responder * parentResponder, StorageCartesianFunctionStore * functionStore, Shared::InteractiveCurveViewRange * curveViewRange, Shared::CurveViewCursor * cursor, int * indexFunctionSelectedByCursor, uint32_t * modelVersion, uint32_t * rangeVersion, Poincare::Preferences::AngleUnit * angleUnitVersion, ButtonRowController * header);
   I18n::Message emptyMessage() override;
diff --git a/apps/graph/graph/storage_graph_controller_helper.cpp b/apps/graph/graph/storage_graph_controller_helper.cpp
new file mode 100644
index 000000000..0a4dc93a8
--- /dev/null
+++ b/apps/graph/graph/storage_graph_controller_helper.cpp
@@ -0,0 +1,35 @@
+#include "storage_graph_controller_helper.h"
+#include "../../constant.h"
+#include "../../shared/poincare_helpers.h"
+
+using namespace Shared;
+using namespace Poincare;
+
+namespace Graph {
+
+bool StorageGraphControllerHelper::privateMoveCursorHorizontally(Shared::CurveViewCursor * cursor, int direction, Shared::InteractiveCurveViewRange * range, int numberOfStepsInGradUnit, StorageCartesianFunction * function, Shared::TextFieldDelegateApp * app, float cursorTopMarginRatio, float cursorRightMarginRatio, float cursorBottomMarginRatio, float cursorLeftMarginRatio) {
+  double xCursorPosition = cursor->x();
+  double x = direction > 0 ? xCursorPosition + range->xGridUnit()/numberOfStepsInGradUnit : xCursorPosition -  range->xGridUnit()/numberOfStepsInGradUnit;
+  double y = function->evaluateAtAbscissa(x, app->localContext());
+  cursor->moveTo(x, y);
+  range->panToMakePointVisible(x, y, cursorTopMarginRatio, cursorRightMarginRatio, cursorBottomMarginRatio, cursorLeftMarginRatio);
+  return true;
+}
+
+void StorageGraphControllerHelper::reloadDerivativeInBannerViewForCursorOnFunction(Shared::CurveViewCursor * cursor, StorageCartesianFunction * function, TextFieldDelegateApp * app) {
+  char buffer[StorageFunctionBannerDelegate<StorageCartesianFunction>::k_maxNumberOfCharacters+PrintFloat::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits)];
+  const char * space = "                  ";
+  int spaceLength = strlen(space);
+  const char * legend = "00(x)=";
+  int legendLength = strlen(legend);
+  int numberOfChar = strlcpy(buffer, legend, legendLength+1);
+  buffer[0] = function->name()[0];
+  buffer[1] = '\'';
+  double y = function->approximateDerivative(cursor->x(), app->localContext());
+  numberOfChar += PoincareHelpers::ConvertFloatToText<double>(y, buffer + legendLength, PrintFloat::bufferSizeForFloatsWithPrecision(Constant::ShortNumberOfSignificantDigits), Constant::ShortNumberOfSignificantDigits);
+  strlcpy(buffer+numberOfChar, space, spaceLength+1);
+  buffer[k_maxDigitLegendLength+6] = 0;
+  bannerView()->setLegendAtIndex(buffer, 2);
+}
+
+}
diff --git a/apps/graph/graph/storage_graph_controller_helper.h b/apps/graph/graph/storage_graph_controller_helper.h
new file mode 100644
index 000000000..e7ce787e0
--- /dev/null
+++ b/apps/graph/graph/storage_graph_controller_helper.h
@@ -0,0 +1,21 @@
+#ifndef GRAPH_STORAGE_GRAPH_CONTROLLER_HELPER_H
+#define GRAPH_STORAGE_GRAPH_CONTROLLER_HELPER_H
+
+#include "../../shared/storage_function_banner_delegate.h"
+#include "../../shared/text_field_delegate_app.h"
+#include "../../shared/interactive_curve_view_range.h"
+#include "../storage_cartesian_function.h"
+
+namespace Graph {
+
+class StorageGraphControllerHelper {
+protected:
+  constexpr static int k_maxDigitLegendLength = 10;
+  bool privateMoveCursorHorizontally(Shared::CurveViewCursor * cursor, int direction, Shared::InteractiveCurveViewRange * range, int numberOfStepsInGradUnit, StorageCartesianFunction * function, Shared::TextFieldDelegateApp * app, float cursorTopMarginRatio, float cursorRightMarginRatio, float cursorBottomMarginRatio, float cursorLeftMarginRatio);
+  void reloadDerivativeInBannerViewForCursorOnFunction(Shared::CurveViewCursor * cursor, StorageCartesianFunction * function, Shared::TextFieldDelegateApp * app);
+  virtual Shared::BannerView * bannerView() = 0;
+};
+
+}
+
+#endif