How to place widgets with Gtk::Grid similarly to Gtk::Table in Gtkmm-3
<p>Originally I learned pyGtk. After a few months I decided to switch to Gtkmm. Reading the oficial documentation it tells that Gtk::Table is deprecated and I should use Gtk::Grid instead.
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If I want to place the widget between the 2nd and 3rd row, and between the 4th and 5th column, I use this code with Gtk::Table.</p>

<pre><code>// Create variable.        
Gtk::Table table;

//Initiate table.
table(10,10,true);

//Place the widget in the proper position.
// table.attach(widget, left_attach, right_attach, top_attach, bottom_attach);
table.attach(widget,4,5,2,3);
</code></pre>

<p>After reading about Gtk::Grid I tried the same thing, but using Gtk::Grid this time.</p>

<pre><code>// Create variable.        
Gtk::Grid grid;

//Place the widget in the proper position.
//grid.attach(widget, left, top, higth, width); 
grid.attach(widget,4,2,1,1);
</code></pre>

<p>But when I try the last code the widget(a button), remains placed in the top left corner. Anyone have a clue about what I'm doing wrong? Does Gtk::Grid has the capacity to do what I want?</p>