diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index 98c9a9466..a3f381e5c 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -515,10 +515,10 @@ sub new {
         $self->{right_panel}->SetSizer($right_sizer);
         $right_sizer->SetMinSize([320, -1]);
         $right_sizer->Add($presets, 0, wxEXPAND | wxTOP, 10) if defined $presets;
-        $right_sizer->Add($frequently_changed_parameters_sizer, 1, wxEXPAND | wxTOP, 0) if defined $frequently_changed_parameters_sizer;
+        $right_sizer->Add($frequently_changed_parameters_sizer, 2, wxEXPAND | wxTOP, 0) if defined $frequently_changed_parameters_sizer;
         $right_sizer->Add($expert_mode_part_sizer, 0, wxEXPAND | wxTOP, 0) if defined $expert_mode_part_sizer;
         $right_sizer->Add($buttons_sizer, 0, wxEXPAND | wxBOTTOM, 5);
-        $right_sizer->Add($info_sizer, 0, wxEXPAND | wxLEFT, 20);
+        $right_sizer->Add($info_sizer, 1, wxEXPAND | wxLEFT, 20);
         $right_sizer->Add($self->{btn_export_gcode}, 0, wxEXPAND | wxLEFT | wxTOP | wxBOTTOM, 20);
         # Callback for showing / hiding the print info box.
         $self->{"print_info_box_show"} = sub {
@@ -847,6 +847,9 @@ sub load_model_objects {
     
         $self->{list}->SetItem($obj_idx, 1, $model_object->instances_count);
         $self->{list}->SetItem($obj_idx, 2, ($model_object->instances->[0]->scaling_factor * 100) . "%");
+
+        # Add object to list on c++ side
+        Slic3r::GUI::add_object_to_list($object->name, $model_object->instances_count, ($model_object->instances->[0]->scaling_factor * 100));
     
         $self->reset_thumbnail($obj_idx);
     }
@@ -894,6 +897,8 @@ sub remove {
     $self->{model}->delete_object($obj_idx);
     $self->{print}->delete_object($obj_idx);
     $self->{list}->DeleteItem($obj_idx);
+    # Delete object from list on c++ side
+    Slic3r::GUI::delete_object_from_list();
     $self->object_list_changed;
     
     $self->select_object(undef);
@@ -917,6 +922,8 @@ sub reset {
     $self->{model}->clear_objects;
     $self->{print}->clear_objects;
     $self->{list}->DeleteAllItems;
+    # Delete all objects from list on c++ side
+    Slic3r::GUI::delete_all_objects_from_list();
     $self->object_list_changed;
     
     $self->select_object(undef);
diff --git a/xs/src/slic3r/GUI/GUI.cpp b/xs/src/slic3r/GUI/GUI.cpp
index 77a1a54b8..7f26816f0 100644
--- a/xs/src/slic3r/GUI/GUI.cpp
+++ b/xs/src/slic3r/GUI/GUI.cpp
@@ -477,7 +477,7 @@ void add_config_menu(wxMenuBar *menu, int event_preferences_changed, int event_l
 
 void add_menus(wxMenuBar *menu, int event_preferences_changed, int event_language_change)
 {
-	add_config_menu(menu, event_language_change, event_language_change);
+	add_config_menu(menu, event_preferences_changed, event_language_change);
 }
 
 // This is called when closing the application, when loading a config file or when starting the config wizard
@@ -1038,36 +1038,52 @@ wxBoxSizer* content_settings(wxWindow *win)
 	return sizer;
 }
 
-void add_object(const std::string &name)
+void add_object_to_list(const std::string &name, int instances_count, int scale)
 {
 	wxString item = name;
-	m_objects_ctrl->Select(m_objects_model->Add(item));
+	m_objects_ctrl->Select(m_objects_model->Add(item, instances_count, scale));
 }
 
-void del_object()
+void delete_object_from_list()
 {
 	auto item = m_objects_ctrl->GetSelection();
-	if (!item) return;
-	m_objects_ctrl->Select(m_objects_model->Delete(item));
+	if (!item || m_objects_model->GetParent(item) != wxDataViewItem(0)) 
+		return;
+// 	m_objects_ctrl->Select(m_objects_model->Delete(item));
+	m_objects_model->Delete(item);
 
 	if (m_objects_model->IsEmpty())
 		m_collpane_settings->show_it(false);
 }
 
+void delete_all_objects_from_list()
+{
+	m_objects_model->DeleteAll();
+	m_collpane_settings->show_it(false);
+}
+
 void add_expert_mode_part(wxWindow* parent, wxBoxSizer* sizer)
 {
 	wxWindowUpdateLocker noUpdates(parent);
 
+	auto btn_grid_sizer = new wxGridSizer(1, 3, 2, 2);
+	sizer->Add(btn_grid_sizer, 0, wxALIGN_LEFT | wxLEFT, 20);
+
 	// Experiments with new UI
 	auto add_btn = new wxButton(parent, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, wxBU_EXACTFIT | wxNO_BORDER);
 	if (wxMSW) add_btn->SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 	add_btn->SetBitmap(wxBitmap(from_u8(Slic3r::var("add.png")), wxBITMAP_TYPE_PNG));
-	sizer->Add(add_btn, 0, wxALIGN_LEFT | wxLEFT | wxTOP, 20);
+	btn_grid_sizer->Add(add_btn, 0, wxEXPAND, 0);
 
 	auto del_btn = new wxButton(parent, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, wxBU_EXACTFIT | wxNO_BORDER);
 	if (wxMSW) del_btn->SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 	del_btn->SetBitmap(wxBitmap(from_u8(Slic3r::var("brick_delete.png")), wxBITMAP_TYPE_PNG));
-	sizer->Add(del_btn, 0, wxALIGN_LEFT | wxLEFT, 20);
+	btn_grid_sizer->Add(del_btn, 0, wxEXPAND, 0);
+
+	auto del_all_btn = new wxButton(parent, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, wxBU_EXACTFIT | wxNO_BORDER);
+	if (wxMSW) del_all_btn->SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
+	del_all_btn->SetBitmap(wxBitmap(from_u8(Slic3r::var("delete.png")), wxBITMAP_TYPE_PNG));
+	btn_grid_sizer->Add(del_all_btn, 0, wxEXPAND, 0);
 
 	// *** Objects List ***	
  	auto collpane = add_prusa_collapsible_pane(parent, sizer, "Objects List:", content_objects_list);
@@ -1095,7 +1111,9 @@ void add_expert_mode_part(wxWindow* parent, wxBoxSizer* sizer)
 		m_objects_ctrl->Select(m_objects_model->Add(name));
 	});
 
-	del_btn->Bind(wxEVT_BUTTON, [](wxEvent& ) { del_object(); });
+	del_btn->Bind(wxEVT_BUTTON, [](wxEvent& ) { delete_object_from_list(); });
+
+	del_all_btn->Bind(wxEVT_BUTTON, [](wxEvent&) { delete_all_objects_from_list(); });
 
 	// More experiments with UI
 // 	auto listctrl = new wxDataViewListCtrl(main_page, wxID_ANY, wxDefaultPosition, wxSize(-1, 100));
@@ -1302,7 +1320,7 @@ void show_buttons(bool show)
 
 void show_scrolled_window_sizer(bool show)
 {
-	g_scrolled_window_sizer->Show(static_cast<size_t>(0), false/*show*/); //don't used now
+	g_scrolled_window_sizer->Show(static_cast<size_t>(0), /*false*/show); //don't used now
 	g_scrolled_window_sizer->Show(1, show);
 	g_scrolled_window_sizer->Show(2, show && g_show_print_info);
 	g_manifold_warning_icon->Show(show && g_show_manifold_warning_icon);
diff --git a/xs/src/slic3r/GUI/GUI.hpp b/xs/src/slic3r/GUI/GUI.hpp
index 79dc2c595..293183e7d 100644
--- a/xs/src/slic3r/GUI/GUI.hpp
+++ b/xs/src/slic3r/GUI/GUI.hpp
@@ -175,9 +175,12 @@ wxString	L_str(const std::string &str);
 wxString	from_u8(const std::string &str);
 
 // Add object to the list
-void add_object(const std::string &name);
+//void add_object(const std::string &name);
+void add_object_to_list(const std::string &name, int instances_count=1, int scale=100);
 // Delete object from the list
-void del_object();
+void delete_object_from_list();
+// Delete all objects from the list
+void delete_all_objects_from_list();
 
 void add_expert_mode_part(wxWindow* parent, wxBoxSizer* sizer);
 void add_frequently_changed_parameters(wxWindow* parent, wxBoxSizer* sizer, wxFlexGridSizer* preset_sizer);
diff --git a/xs/src/slic3r/GUI/wxExtensions.cpp b/xs/src/slic3r/GUI/wxExtensions.cpp
index ecb79caaf..268267cd2 100644
--- a/xs/src/slic3r/GUI/wxExtensions.cpp
+++ b/xs/src/slic3r/GUI/wxExtensions.cpp
@@ -363,6 +363,17 @@ wxDataViewItem MyObjectTreeModel::Add(wxString &name)
 	return child;
 }
 
+wxDataViewItem MyObjectTreeModel::Add(wxString &name, int instances_count, int scale)
+{
+	auto root = new MyObjectTreeModelNode(name, instances_count, scale);
+	m_objects.push_back(root);
+	// notify control
+	wxDataViewItem child((void*)root);
+	wxDataViewItem parent((void*)NULL);
+	ItemAdded(parent, child);
+	return child;
+}
+
 wxDataViewItem MyObjectTreeModel::AddChild(const wxDataViewItem &parent_item, wxString &name)
 {
 	MyObjectTreeModelNode *root = (MyObjectTreeModelNode*)parent_item.GetID();
@@ -431,6 +442,27 @@ wxDataViewItem MyObjectTreeModel::Delete(const wxDataViewItem &item)
 	return ret_item;
 }
 
+void MyObjectTreeModel::DeleteAll()
+{
+	while (!m_objects.empty())
+	{
+		auto object = m_objects.back();
+// 		object->RemoveAllChildren();
+		Delete(wxDataViewItem(object));	
+	}
+}
+
+wxDataViewItem MyObjectTreeModel::GetItemById(int obj_idx)
+{
+	if (obj_idx >= m_objects.size())
+	{
+		printf("Error! Out of objects range.\n");
+		return wxDataViewItem(0);
+	}
+	return wxDataViewItem(m_objects[obj_idx]);
+}
+
+
 wxString MyObjectTreeModel::GetName(const wxDataViewItem &item) const
 {
 	MyObjectTreeModelNode *node = (MyObjectTreeModelNode*)item.GetID();
@@ -475,7 +507,7 @@ void MyObjectTreeModel::GetValue(wxVariant &variant, const wxDataViewItem &item,
 		variant = node->m_scale;
 		break;
 	default:
-		;// wxLogError("MyMusicTreeModel::GetValue: wrong column %d", col);
+		;
 	}
 }
 
diff --git a/xs/src/slic3r/GUI/wxExtensions.hpp b/xs/src/slic3r/GUI/wxExtensions.hpp
index 329eecd59..189637de5 100644
--- a/xs/src/slic3r/GUI/wxExtensions.hpp
+++ b/xs/src/slic3r/GUI/wxExtensions.hpp
@@ -137,11 +137,11 @@ class MyObjectTreeModelNode
 	MyObjectTreeModelNode*			m_parent;
 	MyObjectTreeModelNodePtrArray   m_children;
 public:
-	MyObjectTreeModelNode(	const wxString &name) {
+	MyObjectTreeModelNode(const wxString &name, int instances_count=1, int scale=100) {
 		m_parent	= NULL;
 		m_name		= name;
-		m_copy		= "1";
-		m_scale		= "100%";
+		m_copy		= wxString::Format("%d", instances_count);
+		m_scale		= wxString::Format("%d%%", scale);
 	}
 
 	MyObjectTreeModelNode(	MyObjectTreeModelNode* parent,
@@ -195,6 +195,20 @@ public:
 			m_container = true;
 		m_children.Add(child);
 	}
+	void RemoveAllChildren()
+	{
+		if (GetChildCount() == 0)
+			return;
+		for (size_t id = GetChildCount() - 1; id >= 0; --id)
+		{
+			if (m_children.Item(id)->GetChildCount() > 0)
+				m_children[id]->RemoveAllChildren();
+			auto node = m_children[id];
+			m_children.RemoveAt(id);
+			delete node;
+		}
+	}
+
 	size_t GetChildCount() const
 	{
 		return m_children.GetCount();
@@ -217,8 +231,11 @@ public:
 	}
 
 	wxDataViewItem Add(wxString &name);
+	wxDataViewItem Add(wxString &name, int instances_count, int scale);
 	wxDataViewItem AddChild(const wxDataViewItem &parent_item, wxString &name);
 	wxDataViewItem Delete(const wxDataViewItem &item);
+	void DeleteAll();
+	wxDataViewItem GetItemById(int obj_idx);
 	bool IsEmpty() { return m_objects.empty(); }
 
 	// helper method for wxLog
diff --git a/xs/xsp/GUI.xsp b/xs/xsp/GUI.xsp
index 905954172..b38970c09 100644
--- a/xs/xsp/GUI.xsp
+++ b/xs/xsp/GUI.xsp
@@ -122,11 +122,14 @@ void set_show_manifold_warning_icon(bool show)
 void update_mode()
     %code%{ Slic3r::GUI::update_mode(); %};
 
-void add_object(const char *name)
-    %code%{ Slic3r::GUI::add_object(name); %};
+void add_object_to_list(const char *name, int instances_count, int scale)
+    %code%{ Slic3r::GUI::add_object_to_list(name, instances_count, scale); %};
 
-void del_object()
-    %code%{ Slic3r::GUI::del_object(); %};
+void delete_object_from_list()
+    %code%{ Slic3r::GUI::delete_object_from_list(); %};
+
+void delete_all_objects_from_list()
+    %code%{ Slic3r::GUI::delete_all_objects_from_list(); %};
 
 std::string fold_utf8_to_ascii(const char *src)
     %code%{ RETVAL = Slic3r::fold_utf8_to_ascii(src); %};