diff --git a/xs/src/slic3r/GUI/GUI.cpp b/xs/src/slic3r/GUI/GUI.cpp
index 170051207..991402a51 100644
--- a/xs/src/slic3r/GUI/GUI.cpp
+++ b/xs/src/slic3r/GUI/GUI.cpp
@@ -138,7 +138,8 @@ bool		g_show_print_info = false;
 bool		g_show_manifold_warning_icon = false;
 wxSizer		*m_sizer_object_buttons = nullptr;
 wxSizer		*m_sizer_part_buttons = nullptr;
-wxDataViewCtrl *m_objects_ctrl = nullptr;
+wxDataViewCtrl			*m_objects_ctrl = nullptr;
+MyObjectTreeModel		*m_objects_model = nullptr;
 PrusaCollapsiblePane	*m_collpane_settings = nullptr;
 
 wxFont		g_small_font{ wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT) };
@@ -853,10 +854,10 @@ wxBoxSizer* content_objects_list(wxWindow *win)
 	m_objects_ctrl = new wxDataViewCtrl(win, wxID_ANY, wxDefaultPosition, wxDefaultSize);
 	m_objects_ctrl->SetInitialSize(wxSize(-1, 150)); // TODO - Set correct height according to the opened/closed objects
 	auto objects_sz = new wxBoxSizer(wxVERTICAL);
-	objects_sz->Add(m_objects_ctrl, 1, wxGROW | wxLEFT/*ALL*/, 20/*5*/);
+	objects_sz->Add(m_objects_ctrl, 1, wxGROW | wxLEFT, 20);
 
-	auto objects_model = new MyObjectTreeModel;
-	m_objects_ctrl->AssociateModel(objects_model);
+	m_objects_model = new MyObjectTreeModel;
+	m_objects_ctrl->AssociateModel(m_objects_model);
 #if wxUSE_DRAG_AND_DROP && wxUSE_UNICODE
 	m_objects_ctrl->EnableDragSource(wxDF_UNICODETEXT);
 	m_objects_ctrl->EnableDropTarget(wxDF_UNICODETEXT);
@@ -883,13 +884,13 @@ wxBoxSizer* content_objects_list(wxWindow *win)
 		wxDATAVIEW_COL_SORTABLE | wxDATAVIEW_COL_RESIZABLE);
 	m_objects_ctrl->AppendColumn(column02);
 
-	m_objects_ctrl->Bind(wxEVT_DATAVIEW_SELECTION_CHANGED, [objects_model](wxEvent& evt)
+	m_objects_ctrl->Bind(wxEVT_DATAVIEW_SELECTION_CHANGED, [](wxEvent& evt)
 	{
 		wxWindowUpdateLocker noUpdates(g_right_panel);
 		auto item = m_objects_ctrl->GetSelection();
 		if (!item) return;
 //		m_objects_ctrl->SetSize(m_objects_ctrl->GetBestSize()); // TODO override GetBestSize(), than use it
-		auto show_obj_sizer = objects_model->GetParent(item) == wxDataViewItem(0);
+		auto show_obj_sizer = m_objects_model->GetParent(item) == wxDataViewItem(0);
 		m_sizer_object_buttons->Show(show_obj_sizer);
 		m_sizer_part_buttons->Show(!show_obj_sizer);
 		m_collpane_settings->SetLabelText((show_obj_sizer ? _(L("Object Settings")) : _(L("Part Settings"))) + ":");
@@ -910,6 +911,17 @@ wxBoxSizer* content_edit_object_buttons(wxWindow* win)
     auto btn_split = new wxButton(win, wxID_ANY, "Split"/*" part"*/, wxDefaultPosition, wxDefaultSize, wxBU_EXACTFIT | wxNO_BORDER/*wxBU_LEFT*/);
 	auto btn_move_up = new wxButton(win, wxID_ANY, "", wxDefaultPosition, wxDefaultSize/*wxSize(30, -1)*/, wxBU_LEFT);
 	auto btn_move_down = new wxButton(win, wxID_ANY, "", wxDefaultPosition, wxDefaultSize/*wxSize(30, -1)*/, wxBU_LEFT);
+
+	//*** button's functions
+	btn_load_part->Bind(wxEVT_BUTTON, [](wxEvent&)
+	{
+		auto item = m_objects_ctrl->GetSelection();
+		if (!item) return;
+		wxString name = "Part";
+		m_objects_model->AddChild(item, name);
+	});
+	//***
+
 	btn_move_up->SetMinSize(wxSize(20, -1));
 	btn_move_down->SetMinSize(wxSize(20, -1));
 	btn_load_part->SetBitmap(wxBitmap(from_u8(Slic3r::var("brick_add.png")), wxBITMAP_TYPE_PNG));
@@ -1021,6 +1033,10 @@ void add_expert_mode_part(wxWindow* parent, wxBoxSizer* sizer)
 	wxWindowUpdateLocker noUpdates(parent);
 
 	// 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, 20);
 
 	// *** Objects List ***	
  	auto collpane = add_prusa_collapsible_pane(parent, sizer, "Objects List:", content_objects_list);
@@ -1042,6 +1058,12 @@ void add_expert_mode_part(wxWindow* parent, wxBoxSizer* sizer)
 	m_collpane_settings = add_prusa_collapsible_pane(parent, sizer, "Settings:", content_settings);
 	m_collpane_settings->Hide(); // ? TODO why doesn't work?
 
+	add_btn->Bind(wxEVT_BUTTON, [](wxEvent& )
+	{
+		wxString name = "Object";
+		m_objects_model->Add(name);
+	});
+
 	// More experiments with UI
 // 	auto listctrl = new wxDataViewListCtrl(main_page, wxID_ANY, wxDefaultPosition, wxSize(-1, 100));
 // 	listctrl->AppendToggleColumn("Toggle");
diff --git a/xs/src/slic3r/GUI/wxExtensions.cpp b/xs/src/slic3r/GUI/wxExtensions.cpp
index eb851ffd4..7e7792ee4 100644
--- a/xs/src/slic3r/GUI/wxExtensions.cpp
+++ b/xs/src/slic3r/GUI/wxExtensions.cpp
@@ -352,26 +352,52 @@ bool PrusaCollapsiblePane::Layout()
 // MyObjectTreeModel
 // ----------------------------------------------------------------------------
 
-MyObjectTreeModel::MyObjectTreeModel()
+void MyObjectTreeModel::Add(wxString &name)
 {
-	auto root1 = new MyObjectTreeModelNode("Object1");
-	m_objects.emplace(root1);
+	auto root = new MyObjectTreeModelNode(name);
+	m_objects.emplace(root);
+	// notify control
+	wxDataViewItem child((void*)root);
+	wxDataViewItem parent((void*)NULL);
+	ItemAdded(parent, child);
+}
 
-	auto root2 = new MyObjectTreeModelNode("Object2");
-	m_objects.emplace(root2);
-	root2->Append(new MyObjectTreeModelNode(root2, "SubObject2_1"));
-	root2->Append(new MyObjectTreeModelNode(root2, "SubObject2_2"));
-	root2->Append(new MyObjectTreeModelNode(root2, "SubObject2_3"));
+void MyObjectTreeModel::AddChild(const wxDataViewItem &parent_item, wxString &name)
+{
+	MyObjectTreeModelNode *root = (MyObjectTreeModelNode*)parent_item.GetID();
+	if (!root) return;
 
-	auto root3 = new MyObjectTreeModelNode("Object3");
-	m_objects.emplace(root3);
-	auto root4 = new MyObjectTreeModelNode("Object4");
-	m_objects.emplace(root4);
-	root4->Append(new MyObjectTreeModelNode(root4, "SubObject4_1"));
-	root4->Append(new MyObjectTreeModelNode(root4, "SubObject4_2"));
+	auto node = new MyObjectTreeModelNode(root, name);
+	root->Append(node);
+	// notify control
+	wxDataViewItem child((void*)node);
+	ItemAdded(parent_item, child);
+}
 
-	auto root5 = new MyObjectTreeModelNode("Object5");
-	m_objects.emplace(root5);
+void MyObjectTreeModel::Delete(const wxDataViewItem &item)
+{
+	MyObjectTreeModelNode *node = (MyObjectTreeModelNode*)item.GetID();
+	if (!node)      // happens if item.IsOk()==false
+		return;
+
+	wxDataViewItem parent(node->GetParent());
+	if (!parent.IsOk())
+	{
+// 		wxASSERT(node == m_root);
+		// don't make the control completely empty:
+		//wxLogError("Cannot remove the root item!");
+		return;
+	}
+
+	// first remove the node from the parent's array of children;
+	// NOTE: MyObjectTreeModelNodePtrArray is only an array of _pointers_
+	//       thus removing the node from it doesn't result in freeing it
+	node->GetParent()->GetChildren().Remove(node);
+	// free the node
+	delete node;
+
+	// notify control
+	ItemDeleted(parent, item);
 }
 
 wxString MyObjectTreeModel::GetName(const wxDataViewItem &item) const
@@ -463,7 +489,7 @@ wxDataViewItem MyObjectTreeModel::GetParent(const wxDataViewItem &item) const
 
 	MyObjectTreeModelNode *node = (MyObjectTreeModelNode*)item.GetID();
 
-	// objects nodes also has no parent
+	// objects nodes has no parent too
 	if (m_objects.find(node) != m_objects.end())
 		return wxDataViewItem(0);
 
diff --git a/xs/src/slic3r/GUI/wxExtensions.hpp b/xs/src/slic3r/GUI/wxExtensions.hpp
index 51c77210e..02bcfe148 100644
--- a/xs/src/slic3r/GUI/wxExtensions.hpp
+++ b/xs/src/slic3r/GUI/wxExtensions.hpp
@@ -209,13 +209,17 @@ class MyObjectTreeModel :public wxDataViewModel
 {
 	std::set<MyObjectTreeModelNode*> m_objects;
 public:
-	MyObjectTreeModel();
+	MyObjectTreeModel(){}
 	~MyObjectTreeModel()
 	{
 		for (auto object : m_objects)
 			delete object;		
 	}
 
+	void Add(wxString &name);
+	void AddChild(const wxDataViewItem &parent_item, wxString &name);
+ 	void Delete(const wxDataViewItem &item);
+
 	// helper method for wxLog
 
 	wxString GetName(const wxDataViewItem &item) const;
@@ -224,10 +228,6 @@ public:
 
 	// helper methods to change the model
 
-// 	void AddToClassical(const wxString &title, const wxString &artist,
-// 		unsigned int year);
-// 	void Delete(const wxDataViewItem &item);
-
 	virtual unsigned int GetColumnCount() const override { return 3;}
 	virtual wxString GetColumnType(unsigned int col) const override{ return wxT("string"); }