diff --git a/Gtkmm3/gtk81_treeview3/CMakeLists.txt b/Gtkmm3/gtk81_treeview3/CMakeLists.txt
new file mode 100644
index 0000000..525f8fa
--- /dev/null
+++ b/Gtkmm3/gtk81_treeview3/CMakeLists.txt
@@ -0,0 +1,19 @@
+set(CMAKE_CXX_STANDARD 17)
+cmake_minimum_required(VERSION 3.0.0)
+project(gtk81 VERSION 0.1.0)
+
+include(CTest)
+enable_testing()
+
+set(CPACK_PROJECT_NAME ${PROJECT_NAME})
+set(CPACK_PROJECT_VERSION ${PROJECT_VERSION})
+
+include(CPack)
+
+find_package (PkgConfig REQUIRED)
+pkg_check_modules (GTKMM3 REQUIRED gtkmm-3.0)
+include_directories (${GTKMM3_INCLUDE_DIRS})
+link_directories (${GTKMM3_LIBRARY_DIRS})
+add_executable(gtk81 src/main.cc src/MyWin.cc)
+add_definitions (${GTKMM3_CFLAGS_OTHER})
+target_link_libraries (${PROJECT_NAME} ${GTKMM3_LIBRARIES})
diff --git a/Gtkmm3/gtk81_treeview3/build_mingw.cmd b/Gtkmm3/gtk81_treeview3/build_mingw.cmd
new file mode 100644
index 0000000..039672a
--- /dev/null
+++ b/Gtkmm3/gtk81_treeview3/build_mingw.cmd
@@ -0,0 +1,3 @@
+cd build_mingw
+mingw32-make
+gtk81
\ No newline at end of file
diff --git a/Gtkmm3/gtk81_treeview3/src/MyWin.cc b/Gtkmm3/gtk81_treeview3/src/MyWin.cc
new file mode 100644
index 0000000..52a0986
--- /dev/null
+++ b/Gtkmm3/gtk81_treeview3/src/MyWin.cc
@@ -0,0 +1,122 @@
+#include "MyWin.hh"
+#include <iostream>
+
+MyWin::MyWin()
+:m_vbox(Gtk::ORIENTATION_VERTICAL,0),
+btn_quit("Exit"),
+btn_add("Add Item"),
+btn_del("Delete Item"),
+label_id("ID:"),
+label_text("Text:"),
+label_percent("Percentage:")
+{
+    //Initalize window
+    set_icon_name("org.gtk.daleclack");
+    set_default_size(200,400);
+    set_title("TreeView Test1");
+
+    //Add widgets
+    add(m_vbox);
+    sw.set_policy(Gtk::POLICY_AUTOMATIC,Gtk::POLICY_AUTOMATIC);
+    sw.add(m_treeview);
+    m_vbox.pack_start(sw);
+
+    //Create the store
+    ref_liststore=Gtk::ListStore::create(m_columns);
+    m_treeview.set_model(ref_liststore);
+
+    //Append items
+    row=*(ref_liststore->append());
+    row[m_columns.m_col_id]=1;
+    row[m_columns.m_col_text]="List 1";
+    row[m_columns.m_col_percent]=35;
+
+    row=*(ref_liststore->append());
+    row[m_columns.m_col_id]=2;
+    row[m_columns.m_col_text]="List 2";
+    row[m_columns.m_col_percent]=57;
+
+    row=*(ref_liststore->append());
+    row[m_columns.m_col_id]=3;
+    row[m_columns.m_col_text]="List 3";
+    row[m_columns.m_col_percent]=90;
+
+    //Show Columns
+    m_treeview.append_column("ID",m_columns.m_col_id);
+    m_treeview.append_column("List",m_columns.m_col_text);
+
+    //Show percent number as a progress bar
+    auto cell=Gtk::make_managed<Gtk::CellRendererProgress>();
+    cols_count=m_treeview.append_column("Precentages",*cell);
+    auto pColumn=m_treeview.get_column(cols_count-1);
+    if(pColumn){
+        pColumn->add_attribute(cell->property_value(),m_columns.m_col_percent);
+    }
+
+    //Add Entries
+    m_btnbox_id.pack_start(label_id,Gtk::PACK_SHRINK);
+    m_btnbox_id.pack_start(entry_id,Gtk::PACK_EXPAND_PADDING);
+    m_btnbox_id.set_homogeneous(false);
+    m_btnbox_text.pack_start(label_text,Gtk::PACK_SHRINK);
+    m_btnbox_text.pack_start(entry_text,Gtk::PACK_EXPAND_PADDING);
+    m_btnbox_text.set_homogeneous(false);
+    m_btnbox_percent.pack_start(label_percent,Gtk::PACK_SHRINK);
+    m_btnbox_percent.pack_start(entry_percent,Gtk::PACK_EXPAND_PADDING);
+    m_btnbox_percent.set_homogeneous(false);
+
+    //Show item button
+    btn_del.signal_clicked().connect(sigc::mem_fun(*this,&MyWin::btndel_clicked));
+    m_buttonbox.pack_start(btn_del,Gtk::PACK_SHRINK);
+
+    //"Add Item" button
+    btn_add.signal_clicked().connect(sigc::mem_fun(*this,&MyWin::btnadd_clicked));
+    m_buttonbox.pack_start(btn_add,Gtk::PACK_SHRINK);
+    //"Exit" button
+    btn_quit.signal_clicked().connect(sigc::mem_fun(*this,&MyWin::on_btnquit_clicked));
+    m_buttonbox.pack_end(btn_quit,Gtk::PACK_SHRINK);
+
+    //Pack widgets
+    m_vbox.pack_start(m_btnbox_id,Gtk::PACK_SHRINK);
+    m_vbox.pack_start(m_btnbox_text,Gtk::PACK_SHRINK);
+    m_vbox.pack_start(m_btnbox_percent,Gtk::PACK_SHRINK);
+    m_vbox.pack_end(m_buttonbox,Gtk::PACK_SHRINK);
+    
+    //Show all widgets
+    show_all_children();
+}
+
+void MyWin::on_btnquit_clicked(){
+    hide();
+}
+
+void MyWin::btndel_clicked(){
+    //Delete the iter that selected
+    ref_selection=m_treeview.get_selection();
+    Gtk::TreeModel::iterator iter=ref_selection->get_selected();
+    if(iter){
+        ref_liststore->erase(iter);
+    }
+}
+
+void MyWin::btnadd_clicked(){
+    //Add an Item
+    Glib::ustring str,str_id,str_percent;
+    int id,percent;
+
+    //Get content
+    str_id=entry_id.get_text();
+    str=entry_text.get_text();
+    str_percent=entry_percent.get_text();
+    id=atoi(str_id.c_str());
+    percent=atoi(str_percent.c_str());
+
+    //Append item
+    row=*(ref_liststore->append());
+    row[m_columns.m_col_id]=id;
+    row[m_columns.m_col_text]=str;
+    row[m_columns.m_col_percent]=percent;
+}
+
+MyWin::~MyWin(){
+
+}
diff --git a/Gtkmm3/gtk81_treeview3/src/MyWin.hh b/Gtkmm3/gtk81_treeview3/src/MyWin.hh
new file mode 100644
index 0000000..19681bd
--- /dev/null
+++ b/Gtkmm3/gtk81_treeview3/src/MyWin.hh
@@ -0,0 +1,41 @@
+#pragma once
+
+#include <gtkmm.h>
+
+class MyWin : public Gtk::Window{
+public:
+    MyWin();
+    virtual ~MyWin();
+protected:
+    //Signal Handlers
+    void on_btnquit_clicked();
+    void btndel_clicked();
+    void btnadd_clicked();
+
+    //TreeModel Columns
+    class ModelColumn : public Gtk::TreeModelColumnRecord{
+        public:
+        ModelColumn()
+        {add(m_col_id);add(m_col_text);add(m_col_percent);}
+        Gtk::TreeModelColumn<int> m_col_id;
+        Gtk::TreeModelColumn<Glib::ustring> m_col_text;
+        Gtk::TreeModelColumn<int> m_col_percent;
+    };
+
+    int cols_count;
+    ModelColumn m_columns;
+    Gtk::TreeRow row;
+    Glib::RefPtr<Gtk::ListStore> ref_liststore;
+    Glib::RefPtr<Gtk::TreeSelection> ref_selection;
+
+    //Child widgets
+    Gtk::Box m_vbox;
+    Gtk::ButtonBox m_buttonbox,m_btnbox_id,m_btnbox_text,m_btnbox_percent;
+    Gtk::ScrolledWindow sw;
+    Gtk::TreeView m_treeview;
+    Gtk::Button btn_del;
+    Gtk::Button btn_quit;
+    Gtk::Label label_id,label_text,label_percent;
+    Gtk::Entry entry_id,entry_text,entry_percent;
+    Gtk::Button btn_add;
+};
\ No newline at end of file
diff --git a/Gtkmm3/gtk81_treeview3/src/main.cc b/Gtkmm3/gtk81_treeview3/src/main.cc
new file mode 100644
index 0000000..0c49a3a
--- /dev/null
+++ b/Gtkmm3/gtk81_treeview3/src/main.cc
@@ -0,0 +1,7 @@
+#include "MyWin.hh"
+
+int main(int argc,char **argv){
+    auto app=Gtk::Application::create(argc,argv,"org.gtk.daleclack");
+    MyWin window;
+    return app->run(window);
+}
\ No newline at end of file