Анимация в PictureBox: "рост ёлочки"

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
                 Graphics^ g = pictureBox1->CreateGraphics();
                 HatchBrush^ hBrush = gcnew HatchBrush( HatchStyle::ZigZag, Color::White, Color::Green );
                 HatchBrush^ hBrush1 = gcnew HatchBrush( HatchStyle::ZigZag, Color::White, Color::Brown );
                 
 
     //Set polygons
     array<Point>^ points = {Point(200,10),Point(100,90),Point(300,90)};
     GraphicsPath^ gg = gcnew GraphicsPath();
     array<Point>^ points1 = {Point(200,90),Point(100,170),Point(300,170)};
     GraphicsPath^ gg1 = gcnew GraphicsPath(); 
     array<Point>^ points2 = {Point(200,170),Point(100,250),Point(300,250)};
     GraphicsPath^ gg2 = gcnew GraphicsPath(); 
    
 
     //Draw triangles
 
     g->DrawRectangle(Pens::Brown,175,250,50,70);
     g->FillRectangle(hBrush1, 175,250,50,70);
     gg->AddLines(points);
      gg1->AddLines(points1); 
       gg2->AddLines(points2); 
      //Fill Triangles
      g->FillPath( hBrush, gg);
      g->FillPath( hBrush, gg1);                
      g->FillPath( hBrush, gg2); 
             }