diff --git a/android-app-core/res/values-ru/text_about.xml b/android-app-core/res/values-ru/text_about.xml
index 1c0d6872..4537b879 100644
--- a/android-app-core/res/values-ru/text_about.xml
+++ b/android-app-core/res/values-ru/text_about.xml
@@ -251,4 +251,13 @@
 		3. Исправлено дрожание окна Калькулятора++
 	</string>
 
+    <string name="c_release_notes_for_115">
+        1. Полностью переработан графопостроитель\n
+        2. Добавлена возможность построения нескольких функций на одном графике\n
+        3. Добавлено построение в 3D\n
+        4. Добавлена возможность деать скриншоты графика\n
+        5. Исправлены проблемы с пользовательскими функциями\n
+        6. Другие исправления
+    </string>
+
 </resources>
\ No newline at end of file
diff --git a/android-app-core/res/values/text_about.xml b/android-app-core/res/values/text_about.xml
index d3448dfc..c8a57c53 100644
--- a/android-app-core/res/values/text_about.xml
+++ b/android-app-core/res/values/text_about.xml
@@ -250,5 +250,13 @@
 		3. Fixed flicker for Calculator++ in separate window
 	</string>
 
+    <string name="c_release_notes_for_115">
+        1. Graph plotter completely reworked\n
+        2. Added support for graphing several functions\n
+        3. Added 3D graphing capability\n
+        4. Added support for graph screenshots\n
+        5. Fixed issues with user defined functions\n
+        6. Other fixes
+    </string>
 
 </resources>
\ No newline at end of file
diff --git a/android-app-core/src/main/java/org/solovyev/android/calculator/Threads.java b/android-app-core/src/main/java/org/solovyev/android/calculator/Threads.java
index 7a547641..fa4d0225 100644
--- a/android-app-core/src/main/java/org/solovyev/android/calculator/Threads.java
+++ b/android-app-core/src/main/java/org/solovyev/android/calculator/Threads.java
@@ -3,6 +3,7 @@ package org.solovyev.android.calculator;
 import android.app.Activity;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.solovyev.android.AndroidUtils;
 
 /**
  * User: serso
@@ -17,15 +18,19 @@ public final class Threads {
 
     public static void tryRunOnUiThread(@Nullable final Activity activity, @NotNull final Runnable runnable) {
         if (activity != null && !activity.isFinishing()) {
-            activity.runOnUiThread(new Runnable() {
-                @Override
-                public void run() {
-                    // some time may pass and activity might be closing
-                    if (!activity.isFinishing()) {
-                        runnable.run();
+            if (AndroidUtils.isUiThread()) {
+                runnable.run();
+            } else {
+                activity.runOnUiThread(new Runnable() {
+                    @Override
+                    public void run() {
+                        // some time may pass and activity might be closing
+                        if (!activity.isFinishing()) {
+                            runnable.run();
+                        }
                     }
-                }
-            });
+                });
+            }
         }
     }
 }
diff --git a/android-app/src/main/java/org/solovyev/android/calculator/plot/AbstractCalculatorPlotFragment.java b/android-app/src/main/java/org/solovyev/android/calculator/plot/AbstractCalculatorPlotFragment.java
index 111bf3a8..3672377c 100644
--- a/android-app/src/main/java/org/solovyev/android/calculator/plot/AbstractCalculatorPlotFragment.java
+++ b/android-app/src/main/java/org/solovyev/android/calculator/plot/AbstractCalculatorPlotFragment.java
@@ -2,10 +2,12 @@ package org.solovyev.android.calculator.plot;
 
 import android.content.Context;
 import android.content.Intent;
+import android.content.SharedPreferences;
 import android.graphics.Bitmap;
 import android.graphics.Paint;
 import android.os.Bundle;
 import android.os.Environment;
+import android.preference.PreferenceManager;
 import android.support.v4.app.FragmentActivity;
 import android.view.View;
 import com.actionbarsherlock.app.SherlockFragmentActivity;
@@ -16,6 +18,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.AndroidUtils2;
 import org.solovyev.android.calculator.*;
+import org.solovyev.android.calculator.model.AndroidCalculatorEngine;
 import org.solovyev.android.menu.AMenuItem;
 import org.solovyev.android.menu.ActivityMenu;
 import org.solovyev.android.menu.IdentifiableMenuItem;
@@ -38,7 +41,7 @@ import java.util.concurrent.Executors;
  * Date: 12/30/12
  * Time: 3:09 PM
  */
-public abstract class AbstractCalculatorPlotFragment extends CalculatorFragment implements CalculatorEventListener {
+public abstract class AbstractCalculatorPlotFragment extends CalculatorFragment implements CalculatorEventListener, SharedPreferences.OnSharedPreferenceChangeListener {
 
     /*
     **********************************************************************
@@ -101,6 +104,8 @@ public abstract class AbstractCalculatorPlotFragment extends CalculatorFragment
 
     @Override
     public void onPause() {
+        PreferenceManager.getDefaultSharedPreferences(this.getActivity()).unregisterOnSharedPreferenceChangeListener(this);
+
         final PlotBoundaries plotBoundaries = getPlotBoundaries();
         if (plotBoundaries != null) {
             saveBoundaries(plotBoundaries);
@@ -113,26 +118,40 @@ public abstract class AbstractCalculatorPlotFragment extends CalculatorFragment
     public void onResume() {
         super.onResume();
 
+        PreferenceManager.getDefaultSharedPreferences(this.getActivity()).registerOnSharedPreferenceChangeListener(this);
+
         plotData = Locator.getInstance().getPlotter().getPlotData();
-        createChart(plotData);
-        createGraphicalView(getView(), plotData);
-        getSherlockActivity().invalidateOptionsMenu();
+        updateChart(plotData, getSherlockActivity());
+    }
+
+    @Override
+    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
+        if (AndroidCalculatorEngine.Preferences.angleUnit.getKey().equals(key)) {
+             updateChart(this.plotData, getSherlockActivity());
+        }
     }
 
     @Override
     public void onCalculatorEvent(@NotNull CalculatorEventData calculatorEventData, @NotNull CalculatorEventType calculatorEventType, @Nullable final Object data) {
-        if (calculatorEventType.isOfType(CalculatorEventType.plot_data_changed)) {
-            final CalculatorEventHolder.Result result = this.lastEventHolder.apply(calculatorEventData);
-            if (result.isNewAfter()) {
-                onNewPlotData((PlotData) data);
-            }
+        switch (calculatorEventType) {
+            case plot_data_changed:
+                final CalculatorEventHolder.Result result = this.lastEventHolder.apply(calculatorEventData);
+                if (result.isNewAfter()) {
+                    onNewPlotData((PlotData) data);
+                }
+                break;
         }
+
     }
 
     private void onNewPlotData(@NotNull final PlotData plotData) {
         this.plotData = plotData;
 
         final SherlockFragmentActivity activity = getSherlockActivity();
+        updateChart(plotData, activity);
+    }
+
+    private void updateChart(@NotNull final PlotData plotData, @Nullable final SherlockFragmentActivity activity) {
         Threads.tryRunOnUiThread(activity, new Runnable() {
             @Override
             public void run() {