diff --git a/app/src/main/java/org/solovyev/android/calculator/App.java b/app/src/main/java/org/solovyev/android/calculator/App.java
index 8bf8eb77..e96770ce 100644
--- a/app/src/main/java/org/solovyev/android/calculator/App.java
+++ b/app/src/main/java/org/solovyev/android/calculator/App.java
@@ -22,6 +22,9 @@
 
 package org.solovyev.android.calculator;
 
+import org.solovyev.android.Check;
+import org.solovyev.android.calculator.floating.FloatingCalculatorService;
+
 import android.app.Activity;
 import android.app.Application;
 import android.app.Dialog;
@@ -54,9 +57,6 @@ import android.view.ViewGroup;
 import android.view.inputmethod.InputMethodManager;
 import android.widget.ArrayAdapter;
 
-import org.solovyev.android.Check;
-import org.solovyev.android.calculator.floating.FloatingCalculatorService;
-
 import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 
@@ -283,6 +283,33 @@ public final class App {
         processViewsOfType0(view, viewClass, viewProcessor);
     }
 
+    @Nullable
+    public static <T> T find(@Nonnull View view, @Nonnull Class<T> viewClass) {
+        return find0(view, viewClass);
+    }
+
+    private static <T> T find0(View view, Class<T> viewClass) {
+        if (view instanceof ViewGroup) {
+            final ViewGroup viewGroup = (ViewGroup) view;
+
+            if (viewClass.isAssignableFrom(ViewGroup.class)) {
+                //noinspection unchecked
+                return (T) view;
+            }
+
+            for (int index = 0; index < viewGroup.getChildCount(); index++) {
+                final T child = find0(viewGroup.getChildAt(index), viewClass);
+                if (child != null) {
+                    return child;
+                }
+            }
+        } else if (viewClass.isAssignableFrom(view.getClass())) {
+            //noinspection unchecked
+            return (T) view;
+        }
+        return null;
+    }
+
     @Nonnull
     public static <T> ArrayAdapter<T> makeSimpleSpinnerAdapter(@NonNull Context context) {
         return new ArrayAdapter<>(context, R.layout.support_simple_spinner_dropdown_item);
diff --git a/app/src/main/java/org/solovyev/android/calculator/functions/FunctionParamsView.java b/app/src/main/java/org/solovyev/android/calculator/functions/FunctionParamsView.java
index 3e584185..1ff24d46 100644
--- a/app/src/main/java/org/solovyev/android/calculator/functions/FunctionParamsView.java
+++ b/app/src/main/java/org/solovyev/android/calculator/functions/FunctionParamsView.java
@@ -22,6 +22,11 @@
 
 package org.solovyev.android.calculator.functions;
 
+import org.solovyev.android.Check;
+import org.solovyev.android.calculator.App;
+import org.solovyev.android.calculator.Preferences;
+import org.solovyev.android.calculator.R;
+
 import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.res.Resources;
@@ -36,18 +41,19 @@ import android.view.Gravity;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.inputmethod.EditorInfo;
-import android.widget.*;
-import org.solovyev.android.Check;
-import org.solovyev.android.calculator.App;
-import org.solovyev.android.calculator.Preferences;
-import org.solovyev.android.calculator.R;
+import android.widget.EditText;
+import android.widget.ImageButton;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
 import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
 import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
 
@@ -278,11 +284,9 @@ public class FunctionParamsView extends LinearLayout {
     @Nonnull
     private EditText getParamView(@Nonnull ViewGroup row) {
         final TextInputLayout paramLabel = getParamLabel(row);
-        for (int i = 0; i < paramLabel.getChildCount(); i++) {
-            final View child = paramLabel.getChildAt(i);
-            if (child instanceof EditText) {
-                return (EditText) child;
-            }
+        final EditText paramView = App.find(paramLabel, EditText.class);
+        if (paramView != null) {
+            return paramView;
         }
         Check.shouldNotHappen();
         return null;