diff --git a/GUI/View/FitObjective/FitParameterDelegate.cpp b/GUI/View/FitObjective/FitParameterDelegate.cpp
index e4d39740b2545c084d12d33246a41d137471adad..bec5d14e7433ebe66b286e78d55ccc189b7f72d2 100644
--- a/GUI/View/FitObjective/FitParameterDelegate.cpp
+++ b/GUI/View/FitObjective/FitParameterDelegate.cpp
@@ -14,10 +14,85 @@
 
 #include "GUI/View/FitObjective/FitParameterDelegate.h"
 #include "Base/Util/Assert.h"
+#include "GUI/Model/Job/FitParameterItem.h"
+#include "GUI/Model/Project/ProjectDocument.h"
+#include "GUI/Support/Data/ComboProperty.h"
 #include "GUI/Support/Util/CustomEventFilters.h"
+#include "GUI/View/Numeric/ScientificSpinBox.h"
 #include "GUI/View/PropertyEditor/CustomEditors.h"
-#include "GUI/View/PropertyEditor/PropertyEditorFactory.h"
 #include <QApplication>
+#include <QModelIndex>
+#include <QSpinBox>
+
+namespace {
+
+double getStep(double val)
+{
+    return val == 0.0 ? 1.0 : val / 100.;
+}
+
+bool isDoubleProperty(const QVariant& variant)
+{
+    return variant.type() == QVariant::Double;
+}
+
+bool isComboProperty(const QVariant& variant)
+{
+    return variant.canConvert<ComboProperty>();
+}
+
+bool hasStringRepresentation(const QModelIndex& index)
+{
+    auto variant = index.data();
+    if (isComboProperty(variant))
+        return true;
+    if (isDoubleProperty(variant) && index.internalPointer())
+        return true;
+
+    return false;
+}
+
+QString toString(const QModelIndex& index)
+{
+    auto variant = index.data();
+    if (isComboProperty(variant))
+        return variant.value<ComboProperty>().label();
+
+    if (isDoubleProperty(variant) && index.internalPointer()) {
+        auto* item = static_cast<QObject*>(index.internalPointer());
+        FitDoubleItem* doubleItem = dynamic_cast<FitDoubleItem*>(item);
+        // only "Scientific SpinBoxes" in Fit-Window
+        return ScientificSpinBox::toString(doubleItem->value(), doubleItem->decimals());
+    }
+    return "";
+}
+
+QWidget* createEditor(QObject* item, QWidget* parent)
+{
+    CustomEditor* result(nullptr);
+
+    if (FitDoubleItem* doubleItem = dynamic_cast<FitDoubleItem*>(item)) {
+        // only Scientific SpinBoxes in Fit-Window
+        auto* editor = new ScientificSpinBoxEditor;
+        editor->setLimits(doubleItem->limits());
+        editor->setDecimals(doubleItem->decimals());
+        editor->setSingleStep(getStep(doubleItem->value()));
+        result = editor;
+    } else if (dynamic_cast<FitTypeItem*>(item))
+        result = new ComboPropertyEditor;
+
+    if (parent && result) {
+        result->setParent(parent);
+
+        QObject::connect(result, &CustomEditor::dataChanged,
+                         [=] { gProjectDocument.value()->setModified(); });
+    }
+
+    return result;
+}
+
+} // namespace
+
 
 FitParameterDelegate::FitParameterDelegate(QObject* parent)
     : QStyledItemDelegate(parent)
@@ -27,8 +102,8 @@ FitParameterDelegate::FitParameterDelegate(QObject* parent)
 void FitParameterDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option,
                                  const QModelIndex& index) const
 {
-    if (PropertyEditorFactory::hasStringRepresentation(index)) {
-        QString text = PropertyEditorFactory::toString(index);
+    if (::hasStringRepresentation(index)) {
+        QString text = ::toString(index);
         paintCustomLabel(painter, option, index, text);
     } else
         QStyledItemDelegate::paint(painter, option, index);
@@ -105,7 +180,7 @@ QWidget* FitParameterDelegate::createEditorFromIndex(const QModelIndex& index,
 {
     if (index.internalPointer()) {
         auto* item = static_cast<QObject*>(index.internalPointer());
-        return PropertyEditorFactory::CreateEditor(item, parent);
+        return ::createEditor(item, parent);
     }
     return nullptr;
 }
diff --git a/GUI/View/PropertyEditor/PropertyEditorFactory.cpp b/GUI/View/PropertyEditor/PropertyEditorFactory.cpp
deleted file mode 100644
index cd4ae7fa5ac38776359eae19c8c8d11435062017..0000000000000000000000000000000000000000
--- a/GUI/View/PropertyEditor/PropertyEditorFactory.cpp
+++ /dev/null
@@ -1,92 +0,0 @@
-//  ************************************************************************************************
-//
-//  BornAgain: simulate and fit reflection and scattering
-//
-//! @file      GUI/View/PropertyEditor/PropertyEditorFactory.cpp
-//! @brief     Implements PropertyEditorFactory namespace
-//!
-//! @homepage  http://www.bornagainproject.org
-//! @license   GNU General Public License v3 or higher (see COPYING)
-//! @copyright Forschungszentrum Jülich GmbH 2018
-//! @authors   Scientific Computing Group at MLZ (see CITATION, AUTHORS)
-//
-//  ************************************************************************************************
-
-#include "GUI/View/PropertyEditor/PropertyEditorFactory.h"
-#include "GUI/Model/Job/FitParameterItem.h"
-#include "GUI/Model/Project/ProjectDocument.h"
-#include "GUI/Support/Data/ComboProperty.h"
-#include "GUI/View/Numeric/ScientificSpinBox.h"
-#include "GUI/View/PropertyEditor/CustomEditors.h"
-#include <QModelIndex>
-#include <QSpinBox>
-
-namespace {
-
-double getStep(double val)
-{
-    return val == 0.0 ? 1.0 : val / 100.;
-}
-
-bool isDoubleProperty(const QVariant& variant)
-{
-    return variant.type() == QVariant::Double;
-}
-
-bool isComboProperty(const QVariant& variant)
-{
-    return variant.canConvert<ComboProperty>();
-}
-
-} // namespace
-
-
-bool PropertyEditorFactory::hasStringRepresentation(const QModelIndex& index)
-{
-    auto variant = index.data();
-    if (isComboProperty(variant))
-        return true;
-    if (isDoubleProperty(variant) && index.internalPointer())
-        return true;
-
-    return false;
-}
-
-QString PropertyEditorFactory::toString(const QModelIndex& index)
-{
-    auto variant = index.data();
-    if (isComboProperty(variant))
-        return variant.value<ComboProperty>().label();
-
-    if (isDoubleProperty(variant) && index.internalPointer()) {
-        auto* item = static_cast<QObject*>(index.internalPointer());
-        FitDoubleItem* doubleItem = dynamic_cast<FitDoubleItem*>(item);
-        // only "Scientific SpinBoxes" in Fit-Window
-        return ScientificSpinBox::toString(doubleItem->value(), doubleItem->decimals());
-    }
-    return "";
-}
-
-QWidget* PropertyEditorFactory::CreateEditor(QObject* item, QWidget* parent)
-{
-    CustomEditor* result(nullptr);
-
-    if (FitDoubleItem* doubleItem = dynamic_cast<FitDoubleItem*>(item)) {
-        // only Scientific SpinBoxes in Fit-Window
-        auto* editor = new ScientificSpinBoxEditor;
-        editor->setLimits(doubleItem->limits());
-        editor->setDecimals(doubleItem->decimals());
-        editor->setSingleStep(getStep(doubleItem->value()));
-        result = editor;
-    } else if (dynamic_cast<FitTypeItem*>(item))
-        result = new ComboPropertyEditor;
-
-    if (parent && result) {
-        result->setParent(parent);
-
-        QObject::connect(result, &CustomEditor::dataChanged,
-                         [=] { gProjectDocument.value()->setModified(); });
-    }
-
-    return result;
-}
diff --git a/GUI/View/PropertyEditor/PropertyEditorFactory.h b/GUI/View/PropertyEditor/PropertyEditorFactory.h
deleted file mode 100644
index ed6cb1b86f64248f2ff0ff6c50e976f117e3d777..0000000000000000000000000000000000000000
--- a/GUI/View/PropertyEditor/PropertyEditorFactory.h
+++ /dev/null
@@ -1,35 +0,0 @@
-//  ************************************************************************************************
-//
-//  BornAgain: simulate and fit reflection and scattering
-//
-//! @file      GUI/View/PropertyEditor/PropertyEditorFactory.h
-//! @brief     Defines namespace PropertyEditorFactory
-//!
-//! @homepage  http://www.bornagainproject.org
-//! @license   GNU General Public License v3 or higher (see COPYING)
-//! @copyright Forschungszentrum Jülich GmbH 2018
-//! @authors   Scientific Computing Group at MLZ (see CITATION, AUTHORS)
-//
-//  ************************************************************************************************
-
-#ifndef BORNAGAIN_GUI_VIEW_PROPERTYEDITOR_PROPERTYEDITORFACTORY_H
-#define BORNAGAIN_GUI_VIEW_PROPERTYEDITOR_PROPERTYEDITORFACTORY_H
-
-#include <QWidget>
-
-//! Creates editors for SessionItems.
-
-namespace PropertyEditorFactory {
-
-//! Returns true if the index data has known (custom) conversion to string.
-bool hasStringRepresentation(const QModelIndex& index);
-
-//! Provides string representation of index data.
-QString toString(const QModelIndex& index);
-
-//! Creates an editor suitable for editing of item.value()
-QWidget* CreateEditor(QObject* item, QWidget* parent = nullptr);
-
-} // namespace PropertyEditorFactory
-
-#endif // BORNAGAIN_GUI_VIEW_PROPERTYEDITOR_PROPERTYEDITORFACTORY_H