After a small research I figured out how to do it.
Follow the instructions in link
In Step 6 of that walkthrough, replace 'this' with 'new PropertyPageItem()'
public override void OnToolWindowCreated()
{
ArrayList listObjects = new ArrayList();
listObjects.Add(new PropertyPageItem());
SelectList(listObjects);
}
Following until step 7 on the "Exposing Properties to the Properties Window" section, the objective is achieved and properties in PropertyPageItem class are exposed onto the Visual Studio PropertyWindow.
Hope this is helpful.