diff --git a/apps/graph/Makefile b/apps/graph/Makefile
index d9f7b559d..2cb2d88e3 100644
--- a/apps/graph/Makefile
+++ b/apps/graph/Makefile
@@ -10,6 +10,7 @@ app_objs += $(addprefix apps/graph/,\
   graph/calculation_parameter_controller.o\
   graph/curve_parameter_controller.o\
   graph/graph_controller.o\
+  graph/graph_controller_helper.o\
   graph/graph_view.o\
   list/list_controller.o\
   values/derivative_parameter_controller.o\
diff --git a/apps/graph/graph/graph_controller.cpp b/apps/graph/graph/graph_controller.cpp
index 6ffa7a135..cdce83cbf 100644
--- a/apps/graph/graph/graph_controller.cpp
+++ b/apps/graph/graph/graph_controller.cpp
@@ -85,21 +85,10 @@ void GraphController::reloadBannerView() {
   }
   CartesianFunction * f = m_functionStore->activeFunctionAtIndex(m_indexFunctionSelectedByCursor);
   TextFieldDelegateApp * myApp = (TextFieldDelegateApp *)app();
-  char buffer[k_maxNumberOfCharacters+PrintFloat::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits)];
-  const char * space = "                  ";
-  int spaceLength = strlen(space);
-  if (m_displayDerivativeInBanner || type() == GraphView::Type::Tangent) {
-    const char * legend = "00(x)=";
-    int legendLength = strlen(legend);
-    int numberOfChar = strlcpy(buffer, legend, legendLength+1);
-    buffer[0] = f->name()[0];
-    buffer[1] = '\'';
-    double y = f->approximateDerivative(m_cursor->x(), myApp->localContext());
-    numberOfChar += Complex<double>::convertFloatToText(y, buffer + legendLength, PrintFloat::bufferSizeForFloatsWithPrecision(Constant::MediumNumberOfSignificantDigits), Constant::MediumNumberOfSignificantDigits);
-    strlcpy(buffer+numberOfChar, space, spaceLength+1);
-    buffer[k_maxLegendLength] = 0;
-    m_bannerView.setLegendAtIndex(buffer, 2);
-  }
+  reloadDerivativeInBannerViewForCursorOnFunction(m_cursor, f, myApp);
+
+
+  char buffer[FunctionBannerDelegate::k_maxNumberOfCharacters+PrintFloat::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits)];
   if (type() == GraphView::Type::Tangent) {
     const char * legend = "a=";
     int legendLength = strlen(legend);
@@ -118,15 +107,9 @@ void GraphController::reloadBannerView() {
 }
 
 bool GraphController::moveCursorHorizontally(int direction) {
-  double xCursorPosition = m_cursor->x();
-  double x = direction > 0 ? xCursorPosition + m_graphRange->xGridUnit()/k_numberOfCursorStepsInGradUnit :
-    xCursorPosition -  m_graphRange->xGridUnit()/k_numberOfCursorStepsInGradUnit;
   CartesianFunction * f = m_functionStore->activeFunctionAtIndex(m_indexFunctionSelectedByCursor);
   TextFieldDelegateApp * myApp = (TextFieldDelegateApp *)app();
-  double y = f->evaluateAtAbscissa(x, myApp->localContext());
-  m_cursor->moveTo(x, y);
-  m_graphRange->panToMakePointVisible(x, y, k_cursorTopMarginRatio, k_cursorRightMarginRatio, k_cursorBottomMarginRatio, k_cursorLeftMarginRatio);
-  return true;
+  return privateMoveCursorHorizontally(m_cursor, direction, m_graphRange, k_numberOfCursorStepsInGradUnit, f, myApp, k_cursorTopMarginRatio, k_cursorRightMarginRatio, k_cursorBottomMarginRatio, k_cursorLeftMarginRatio);
 }
 
 void GraphController::initCursorParameters() {
diff --git a/apps/graph/graph/graph_controller.h b/apps/graph/graph/graph_controller.h
index 3ab7cabe7..75213a816 100644
--- a/apps/graph/graph/graph_controller.h
+++ b/apps/graph/graph/graph_controller.h
@@ -2,6 +2,7 @@
 #define GRAPH_GRAPH_CONTROLLER_H
 
 #include "graph_view.h"
+#include "graph_controller_helper.h"
 #include "banner_view.h"
 #include "curve_parameter_controller.h"
 #include "../../shared/function_graph_controller.h"
@@ -11,7 +12,7 @@
 
 namespace Graph {
 
-class GraphController : public Shared::FunctionGraphController {
+class GraphController : public Shared::FunctionGraphController, public GraphControllerHelper {
 public:
   GraphController(Responder * parentResponder, CartesianFunctionStore * functionStore, Shared::InteractiveCurveViewRange * curveViewRange, Shared::CurveViewCursor * cursor, uint32_t * modelVersion, uint32_t * rangeVersion, Poincare::Expression::AngleUnit * angleUnitVersion, ButtonRowController * header);
   const char * title() override;
diff --git a/apps/graph/graph/graph_controller_helper.cpp b/apps/graph/graph/graph_controller_helper.cpp
new file mode 100644
index 000000000..faa280942
--- /dev/null
+++ b/apps/graph/graph/graph_controller_helper.cpp
@@ -0,0 +1,34 @@
+#include "graph_controller_helper.h"
+#include "../../constant.h"
+
+using namespace Shared;
+using namespace Poincare;
+
+namespace Graph {
+
+bool GraphControllerHelper::privateMoveCursorHorizontally(Shared::CurveViewCursor * cursor, int direction, Shared::InteractiveCurveViewRange * range, int numberOfStepsInGradUnit, Shared::Function * 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 GraphControllerHelper::reloadDerivativeInBannerViewForCursorOnFunction(Shared::CurveViewCursor * cursor, CartesianFunction * function, TextFieldDelegateApp * app) {
+  char buffer[FunctionBannerDelegate::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 += Complex<double>::convertFloatToText(y, buffer + legendLength, PrintFloat::bufferSizeForFloatsWithPrecision(Constant::MediumNumberOfSignificantDigits), Constant::MediumNumberOfSignificantDigits);
+  strlcpy(buffer+numberOfChar, space, spaceLength+1);
+  buffer[Shared::FunctionBannerDelegate::k_maxLegendLength] = 0;
+  bannerView()->setLegendAtIndex(buffer, 2);
+}
+
+}
diff --git a/apps/graph/graph/graph_controller_helper.h b/apps/graph/graph/graph_controller_helper.h
new file mode 100644
index 000000000..2fc0960e0
--- /dev/null
+++ b/apps/graph/graph/graph_controller_helper.h
@@ -0,0 +1,20 @@
+#ifndef GRAPH_GRAPH_CONTROLLER_HELPER_H
+#define GRAPH_GRAPH_CONTROLLER_HELPER_H
+
+#include "../../shared/function_banner_delegate.h"
+#include "../../shared/text_field_delegate_app.h"
+#include "../../shared/interactive_curve_view_range.h"
+#include "../cartesian_function_store.h"
+
+namespace Graph {
+
+class GraphControllerHelper {
+protected:
+  bool privateMoveCursorHorizontally(Shared::CurveViewCursor * cursor, int direction, Shared::InteractiveCurveViewRange * range, int numberOfStepsInGradUnit, Shared::Function * function, Shared::TextFieldDelegateApp * app, float cursorTopMarginRatio, float cursorRightMarginRatio, float cursorBottomMarginRatio, float cursorLeftMarginRatio);
+  void reloadDerivativeInBannerViewForCursorOnFunction(Shared::CurveViewCursor * cursor, CartesianFunction * function, Shared::TextFieldDelegateApp * app);
+  virtual Shared::BannerView * bannerView() = 0;
+};
+
+}
+
+#endif
diff --git a/apps/shared/function_banner_delegate.h b/apps/shared/function_banner_delegate.h
index 7811f9074..d557110c8 100644
--- a/apps/shared/function_banner_delegate.h
+++ b/apps/shared/function_banner_delegate.h
@@ -8,9 +8,10 @@
 namespace Shared {
 
 class FunctionBannerDelegate  {
-protected:
+public:
   constexpr static int k_maxLegendLength = 14;
   constexpr static int k_maxNumberOfCharacters = 50;
+protected:
   void reloadBannerViewForCursorOnFunction(CurveViewCursor * cursor, Function * function, char symbol);
   virtual BannerView * bannerView() = 0;
 };