diff --git a/src/libs/vtools/dialogs/tools/dialogseamallowance.cpp b/src/libs/vtools/dialogs/tools/dialogseamallowance.cpp
index 52f02e3c3..34156dce2 100644
--- a/src/libs/vtools/dialogs/tools/dialogseamallowance.cpp
+++ b/src/libs/vtools/dialogs/tools/dialogseamallowance.cpp
@@ -52,6 +52,7 @@ DialogSeamAllowance::DialogSeamAllowance(const VContainer *data, const quint32 &
 
     ui->listWidget->setContextMenuPolicy(Qt::CustomContextMenu);
     connect(ui->listWidget, &QListWidget::customContextMenuRequested, this, &DialogSeamAllowance::ShowContextMenu);
+    connect(ui->listWidget->model(), &QAbstractItemModel::rowsMoved, this, &DialogSeamAllowance::ListChanged);
 
     vis = new VisToolPiece(data);
 }
@@ -97,50 +98,53 @@ void DialogSeamAllowance::SetPiece(const VPiece &piece)
  */
 void DialogSeamAllowance::ChosenObject(quint32 id, const SceneObject &type)
 {
-    bool reverse = false;
-    if (QGuiApplication::keyboardModifiers() == Qt::ShiftModifier)
+    if (not prepare)
     {
-        reverse = true;
-    }
-    switch (type)
-    {
-        case SceneObject::Arc:
-            NewItem(VPieceNode(id, Tool::NodeArc, reverse));
-            break;
-        case SceneObject::Point:
-            NewItem(VPieceNode(id, Tool::NodePoint));
-            break;
-        case SceneObject::Spline:
-            NewItem(VPieceNode(id, Tool::NodeSpline, reverse));
-            break;
-        case SceneObject::SplinePath:
-            NewItem(VPieceNode(id, Tool::NodeSplinePath, reverse));
-            break;
-        case (SceneObject::Line):
-        case (SceneObject::Detail):
-        case (SceneObject::Unknown):
-        default:
-            qDebug() << "Got wrong scene object. Ignore.";
-            break;
-    }
+        bool reverse = false;
+        if (QGuiApplication::keyboardModifiers() == Qt::ShiftModifier)
+        {
+            reverse = true;
+        }
+        switch (type)
+        {
+            case SceneObject::Arc:
+                NewItem(VPieceNode(id, Tool::NodeArc, reverse));
+                break;
+            case SceneObject::Point:
+                NewItem(VPieceNode(id, Tool::NodePoint));
+                break;
+            case SceneObject::Spline:
+                NewItem(VPieceNode(id, Tool::NodeSpline, reverse));
+                break;
+            case SceneObject::SplinePath:
+                NewItem(VPieceNode(id, Tool::NodeSplinePath, reverse));
+                break;
+            case (SceneObject::Line):
+            case (SceneObject::Detail):
+            case (SceneObject::Unknown):
+            default:
+                qDebug() << "Got wrong scene object. Ignore.";
+                break;
+        }
 
-    ValidObjects(MainPathIsValid());
+        ValidObjects(MainPathIsValid());
 
-    auto visPath = qobject_cast<VisToolPiece *>(vis);
-    SCASSERT(visPath != nullptr);
-    const VPiece p = CreatePiece();
-    visPath->SetPiece(p);
+        auto visPath = qobject_cast<VisToolPiece *>(vis);
+        SCASSERT(visPath != nullptr);
+        const VPiece p = CreatePiece();
+        visPath->SetPiece(p);
 
-    if (p.CountNode() == 1)
-    {
-        emit ToolTip(tr("Select main path objects clockwise, <b>Shift</b> - reverse direction curve, "
-                        "<b>Enter</b> - finish creation"));
+        if (p.CountNode() == 1)
+        {
+            emit ToolTip(tr("Select main path objects clockwise, <b>Shift</b> - reverse direction curve, "
+                            "<b>Enter</b> - finish creation"));
 
-        visPath->VisualMode(NULL_ID);
-    }
-    else
-    {
-        visPath->RefreshGeometry();
+            visPath->VisualMode(NULL_ID);
+        }
+        else
+        {
+            visPath->RefreshGeometry();
+        }
     }
 }
 
@@ -150,7 +154,15 @@ void DialogSeamAllowance::ShowDialog(bool click)
     if (click == false)
     {
         emit ToolTip("");
-        setModal(true);
+        prepare = true;
+
+        auto visPath = qobject_cast<VisToolPiece *>(vis);
+        SCASSERT(visPath != nullptr);
+        visPath->SetMode(Mode::Show);
+        visPath->RefreshGeometry();
+
+        // Fix issue #526. Dialog Detail is not on top after selection second object on Mac.
+        setWindowFlags(windowFlags() | Qt::WindowStaysOnTopHint);
         show();
     }
 }
@@ -211,6 +223,17 @@ void DialogSeamAllowance::ShowContextMenu(const QPoint &pos)
         rowItem->setText(GetNodeName(rowNode));
         ValidObjects(MainPathIsValid());
     }
+
+    ListChanged();
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+void DialogSeamAllowance::ListChanged()
+{
+    auto visPath = qobject_cast<VisToolPiece *>(vis);
+    SCASSERT(visPath != nullptr);
+    visPath->SetPiece(CreatePiece());
+    visPath->RefreshGeometry();
 }
 
 //---------------------------------------------------------------------------------------------------------------------
diff --git a/src/libs/vtools/dialogs/tools/dialogseamallowance.h b/src/libs/vtools/dialogs/tools/dialogseamallowance.h
index c9134338a..5657147a5 100644
--- a/src/libs/vtools/dialogs/tools/dialogseamallowance.h
+++ b/src/libs/vtools/dialogs/tools/dialogseamallowance.h
@@ -61,6 +61,7 @@ protected:
 
 private slots:
     void ShowContextMenu(const QPoint &pos);
+    void ListChanged();
 
 private:
     Q_DISABLE_COPY(DialogSeamAllowance)
diff --git a/src/libs/vtools/visualization/path/vistoolpiece.cpp b/src/libs/vtools/visualization/path/vistoolpiece.cpp
index 3ae7e9b14..f085d8e59 100644
--- a/src/libs/vtools/visualization/path/vistoolpiece.cpp
+++ b/src/libs/vtools/visualization/path/vistoolpiece.cpp
@@ -47,6 +47,8 @@ VisToolPiece::~VisToolPiece()
 //---------------------------------------------------------------------------------------------------------------------
 void VisToolPiece::RefreshGeometry()
 {
+    HideAllItems();
+
     if (m_piece.CountNode() > 0)
     {
         DrawPath(this, m_piece.MainPathPath(Visualization::data), mainColor, Qt::SolidLine, Qt::RoundCap);
@@ -59,12 +61,15 @@ void VisToolPiece::RefreshGeometry()
             DrawPoint(point, nodes.at(i), supportColor);
         }
 
-        const QVector<QPointF> points = m_piece.MainPathPoints(Visualization::data);
-        DrawLine(m_line1, QLineF(points.first(), Visualization::scenePos), supportColor, Qt::DashLine);
-
-        if (points.size() > 1)
+        if (mode == Mode::Creation)
         {
-            DrawLine(m_line2, QLineF(points.last(), Visualization::scenePos), supportColor, Qt::DashLine);
+            const QVector<QPointF> points = m_piece.MainPathPoints(Visualization::data);
+            DrawLine(m_line1, QLineF(points.first(), Visualization::scenePos), supportColor, Qt::DashLine);
+
+            if (points.size() > 1)
+            {
+                DrawLine(m_line2, QLineF(points.last(), Visualization::scenePos), supportColor, Qt::DashLine);
+            }
         }
     }
 }
@@ -80,3 +85,26 @@ QGraphicsEllipseItem *VisToolPiece::GetPoint(quint32 i, const QColor &color)
 {
     return GetPointItem(Visualization::data, factor, m_points, i, color, this);
 }
+
+//---------------------------------------------------------------------------------------------------------------------
+void VisToolPiece::HideAllItems()
+{
+    if (m_line1)
+    {
+        m_line1->setVisible(false);
+    }
+
+    if (m_line2)
+    {
+        m_line2->setVisible(false);
+    }
+
+    QVector<QGraphicsEllipseItem *> m_points;
+    for (int i=0; i < m_points.size(); ++i)
+    {
+        if (QGraphicsEllipseItem *item = m_points.at(i))
+        {
+            item->setVisible(false);
+        }
+    }
+}
diff --git a/src/libs/vtools/visualization/path/vistoolpiece.h b/src/libs/vtools/visualization/path/vistoolpiece.h
index f647924a2..a9071d5e4 100644
--- a/src/libs/vtools/visualization/path/vistoolpiece.h
+++ b/src/libs/vtools/visualization/path/vistoolpiece.h
@@ -55,6 +55,8 @@ private:
     VPiece m_piece;
 
     QGraphicsEllipseItem* GetPoint(quint32 i, const QColor &color);
+
+    void HideAllItems();
 };
 
 #endif // VISTOOLPIECE_H