diff --git a/apps/graph/app.cpp b/apps/graph/app.cpp
index 581877d5f..b8db422f3 100644
--- a/apps/graph/app.cpp
+++ b/apps/graph/app.cpp
@@ -82,4 +82,8 @@ const char * App::XNT() {
   return "x";
 }
 
+Responder * App::graphControllerParent() {
+  return &m_graphAlternateEmptyViewController;
+}
+
 }
diff --git a/apps/graph/app.h b/apps/graph/app.h
index 328579cf7..426ea76d8 100644
--- a/apps/graph/app.h
+++ b/apps/graph/app.h
@@ -34,6 +34,7 @@ public:
   };
   InputViewController * inputViewController() override;
   const char * XNT() override;
+  Responder * graphControllerParent();
 private:
   App(Container * container, Snapshot * snapshot);
   ListController m_listController;
diff --git a/apps/graph/graph/calculation_parameter_controller.cpp b/apps/graph/graph/calculation_parameter_controller.cpp
index 5fe14061c..669215dcc 100644
--- a/apps/graph/graph/calculation_parameter_controller.cpp
+++ b/apps/graph/graph/calculation_parameter_controller.cpp
@@ -1,4 +1,5 @@
 #include "calculation_parameter_controller.h"
+#include "graph_controller.h"
 #include <assert.h>
 #include <cmath>
 
@@ -6,11 +7,12 @@ using namespace Shared;
 
 namespace Graph {
 
-CalculationParameterController::CalculationParameterController(Responder * parentResponder) :
+CalculationParameterController::CalculationParameterController(Responder * parentResponder, GraphController * graphController) :
   ViewController(parentResponder),
   m_selectableTableView(this, this, 0, 1, Metric::CommonTopMargin, Metric::CommonRightMargin,
     Metric::CommonBottomMargin, Metric::CommonLeftMargin, this),
-  m_function(nullptr)
+  m_function(nullptr),
+  m_graphController(graphController)
 {
 }
 
@@ -29,7 +31,19 @@ void CalculationParameterController::didBecomeFirstResponder() {
 
 bool CalculationParameterController::handleEvent(Ion::Events::Event event) {
   if (event == Ion::Events::OK || event == Ion::Events::EXE) {
-    return true;
+    switch(selectedRow()) {
+      case 4:
+      {
+        StackViewController * stack = (StackViewController *)parentResponder();
+        stack->pop();
+        stack->pop();
+        m_graphController->setType(GraphController::Type::Tangent);
+        stack->push(m_graphController);
+        return true;
+      }
+      default:
+        return false;
+    }
   }
   return false;
 }
diff --git a/apps/graph/graph/calculation_parameter_controller.h b/apps/graph/graph/calculation_parameter_controller.h
index c18e74cd6..4e81e93a3 100644
--- a/apps/graph/graph/calculation_parameter_controller.h
+++ b/apps/graph/graph/calculation_parameter_controller.h
@@ -7,9 +7,11 @@
 
 namespace Graph {
 
+class GraphController;
+
 class CalculationParameterController : public ViewController, public SimpleListViewDataSource, public SelectableTableViewDataSource {
 public:
-  CalculationParameterController(Responder * parentResponder);
+  CalculationParameterController(Responder * parentResponder, GraphController * graphController);
   View * view() override;
   const char * title() override;
   bool handleEvent(Ion::Events::Event event) override;
@@ -25,6 +27,7 @@ private:
   MessageTableCell m_cells[k_totalNumberOfCells];
   SelectableTableView m_selectableTableView;
   Shared::Function * m_function;
+  GraphController * m_graphController;
 };
 
 }
diff --git a/apps/graph/graph/curve_parameter_controller.cpp b/apps/graph/graph/curve_parameter_controller.cpp
index 004df9c7b..2d26e3913 100644
--- a/apps/graph/graph/curve_parameter_controller.cpp
+++ b/apps/graph/graph/curve_parameter_controller.cpp
@@ -1,4 +1,5 @@
 #include "curve_parameter_controller.h"
+#include "graph_controller.h"
 #include "../../i18n.h"
 #include <assert.h>
 
@@ -6,13 +7,13 @@ using namespace Shared;
 
 namespace Graph {
 
-CurveParameterController::CurveParameterController(InteractiveCurveViewRange * graphRange, BannerView * bannerView, CurveViewCursor * cursor) :
+CurveParameterController::CurveParameterController(InteractiveCurveViewRange * graphRange, BannerView * bannerView, CurveViewCursor * cursor, GraphController * graphController) :
   FunctionCurveParameterController(graphRange, cursor),
   m_goToParameterController(this, graphRange, cursor, I18n::Message::X),
   m_bannerView(bannerView),
   m_calculationCell(I18n::Message::Compute),
   m_derivativeCell(I18n::Message::DerivateNumber),
-  m_calculationParameterController(this)
+  m_calculationParameterController(this, graphController)
 {
 }
 
diff --git a/apps/graph/graph/curve_parameter_controller.h b/apps/graph/graph/curve_parameter_controller.h
index cb00b7752..9753a9d50 100644
--- a/apps/graph/graph/curve_parameter_controller.h
+++ b/apps/graph/graph/curve_parameter_controller.h
@@ -7,9 +7,11 @@
 
 namespace Graph {
 
+class GraphController;
+
 class CurveParameterController : public Shared::FunctionCurveParameterController {
 public:
-  CurveParameterController(Shared::InteractiveCurveViewRange * graphRange, BannerView * bannerView, Shared::CurveViewCursor * cursor);
+  CurveParameterController(Shared::InteractiveCurveViewRange * graphRange, BannerView * bannerView, Shared::CurveViewCursor * cursor, GraphController * graphController);
   const char * title() override;
   bool handleEvent(Ion::Events::Event event) override;
   int numberOfRows() override;
diff --git a/apps/graph/graph/graph_controller.cpp b/apps/graph/graph/graph_controller.cpp
index aedac3d4f..c9871604d 100644
--- a/apps/graph/graph/graph_controller.cpp
+++ b/apps/graph/graph/graph_controller.cpp
@@ -1,4 +1,5 @@
 #include "graph_controller.h"
+#include "../app.h"
 
 using namespace Shared;
 using namespace Poincare;
@@ -10,12 +11,22 @@ GraphController::GraphController(Responder * parentResponder, CartesianFunctionS
   m_bannerView(),
   m_view(functionStore, curveViewRange, m_cursor, &m_bannerView, &m_cursorView),
   m_graphRange(curveViewRange),
-  m_curveParameterController(curveViewRange, &m_bannerView, m_cursor),
-  m_functionStore(functionStore)
+  m_curveParameterController(curveViewRange, &m_bannerView, m_cursor, this),
+  m_functionStore(functionStore),
+  m_type(Type::Default)
 {
   m_graphRange->setDelegate(this);
 }
 
+const char * GraphController::title() {
+  switch(m_type) {
+    case Type::Tangent:
+      return I18n::translate(I18n::Message::Tangent);
+    default:
+      return I18n::translate(I18n::Message::GraphTab);
+  }
+}
+
 I18n::Message GraphController::emptyMessage() {
   if (m_functionStore->numberOfDefinedFunctions() == 0) {
     return I18n::Message::NoFunction;
@@ -23,11 +34,30 @@ I18n::Message GraphController::emptyMessage() {
   return I18n::Message::NoActivatedFunction;
 }
 
+bool GraphController::handleEvent(Ion::Events::Event event) {
+  if (m_type == Type::Default || event == Ion::Events::Left || event == Ion::Events::Right || event == Ion::Events::Plus || event == Ion::Events::Minus) {
+    return FunctionGraphController::handleEvent(event);
+  }
+  // TODO: handle for type != Type::Default
+  if (m_type != Type::Default && event == Ion::Events::Back) {
+    stackController()->handleEvent(event);
+    setType(Type::Default);
+    setParentResponder(static_cast<App *>(app())->graphControllerParent());
+    return true;
+  }
+  return false;
+}
+
+void GraphController::setType(Type type) {
+  m_type = type;
+}
+
 BannerView * GraphController::bannerView() {
   return &m_bannerView;
 }
 
 void GraphController::reloadBannerView() {
+  // TODO: do something else if m_type == Type::tangent
   FunctionGraphController::reloadBannerView();
   if (!m_bannerView.displayDerivative()) {
     return;
@@ -90,4 +120,11 @@ CurveParameterController * GraphController::curveParameterController() {
   return &m_curveParameterController;
 }
 
+StackViewController * GraphController::stackController() const{
+  if (m_type != Type::Default) {
+    return (StackViewController *)(parentResponder());
+  }
+  return FunctionGraphController::stackController();
+}
+
 }
diff --git a/apps/graph/graph/graph_controller.h b/apps/graph/graph/graph_controller.h
index 2f2645bc1..ca9e4c9cd 100644
--- a/apps/graph/graph/graph_controller.h
+++ b/apps/graph/graph/graph_controller.h
@@ -13,8 +13,16 @@ namespace Graph {
 
 class GraphController : public Shared::FunctionGraphController {
 public:
+  enum class Type {
+    Default,
+    Tangent,
+    Integral
+  };
   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;
   I18n::Message emptyMessage() override;
+  bool handleEvent(Ion::Events::Event event) override;
+  void setType(Type type);
 private:
   BannerView * bannerView() override;
   void reloadBannerView() override;
@@ -24,11 +32,13 @@ private:
   CartesianFunctionStore * functionStore() const override;
   GraphView * functionGraphView() override;
   CurveParameterController * curveParameterController() override;
+  StackViewController * stackController() const override;
   BannerView m_bannerView;
   GraphView m_view;
   Shared::InteractiveCurveViewRange * m_graphRange;
   CurveParameterController m_curveParameterController;
   CartesianFunctionStore * m_functionStore;
+  Type m_type;
 };
 
 }
diff --git a/apps/shared/interactive_curve_view_controller.cpp b/apps/shared/interactive_curve_view_controller.cpp
index 6cf440b08..acb44ceb0 100644
--- a/apps/shared/interactive_curve_view_controller.cpp
+++ b/apps/shared/interactive_curve_view_controller.cpp
@@ -171,7 +171,7 @@ void InteractiveCurveViewController::willExitResponderChain(Responder * nextFirs
 }
 
 Responder * InteractiveCurveViewController::tabController() const{
-  return (parentResponder()->parentResponder()->parentResponder()->parentResponder());
+  return (stackController()->parentResponder());
 }
 
 StackViewController * InteractiveCurveViewController::stackController() const{
diff --git a/apps/shared/interactive_curve_view_controller.h b/apps/shared/interactive_curve_view_controller.h
index ea1f5c891..a1f239dd8 100644
--- a/apps/shared/interactive_curve_view_controller.h
+++ b/apps/shared/interactive_curve_view_controller.h
@@ -39,7 +39,7 @@ protected:
   virtual BannerView * bannerView() = 0;
   virtual bool handleEnter() = 0;
   Responder * tabController() const;
-  StackViewController * stackController() const;
+  virtual StackViewController * stackController() const;
   virtual void reloadBannerView() = 0;
   virtual void initRangeParameters() = 0;
   virtual void initCursorParameters() = 0;