Yes, thanks... I didn't noticed the QueryRepeater control!

Notwithstanding, this solution has a little problem...
For the alphabetical sort I needed to display it like this:

A

Aproduct1
Aproduct2

B

BProduct1

...

For solving the problem I've created a function in code behind wich uses ViewState[]... the problem is that althought 'Enable viewstate' was true, the viewstate var was reseted at every new row that was shown, so that I got something like this:

A

Aproduct1

A
Aproduct2

B
Bproduct1

...

Surfing into Google I've found this:

http://scottonwriting.net/sowblog/posts/2129.aspx

Maybe you could make something for your futures versions of the kentico CMS...

The solution I've done is:

Use a normal repeater with the item template defined in the same aspx page
in code-behind retrieve datasource as the SQL query I'd used in the QueryRepeater solution and bind the data.
As ViewState works fine xhen the item template is in the same page, this possibility shows the content as I needed.

Your CMSRepeater,CMSDatalist, QueryRepeater and also works great when you have not to touch code-behind in the ASCX file but due of the loadtemplate instruction, they're difficult to use in other cases.

Just one last question:
It's possible to call a function to retrieve the datasource of your QueryRepeater and display it with basic repeaters or datalist?
(By now I create my own connexion to the DataBase to retrieve infos)

SqlConnection cn = new SqlConnection();
cn.ConnectionString = ConfigurationSettings.AppSettings["CMSConnectionString"];
SqlDataAdapter da = new SqlDataAdapter(SQLString ,cn);
DataSet ds = new DataSet();
try
{
da.Fill(ds);
}
finally
{
cn.Close();
}