We recently received a request if RadControls for ASP.NET Ajax support IronPython and the answer is “yes”.
Yesterday I tested our latest SP1 release of RadControls for ASP.NET AJAX against the Microsoft ASP.NET Futures (July 2007) and it seems there are no problems.
Here are some screenshots how the RadComboBox control gets updated by RadAjaxManager – design and run-time:

 

Design-time:

Run-time:

 

And here is the sample code we used:

def Page_Load(sender, e):
    RadComboBox1.SelectedIndexChanged += RadComboBox1_SelectedIndexChanged
    pass
 
def Button1_Click(sender, eventArgs):
    RadComboBox1.Text="updated"
    pass
    
def RadComboBox1_SelectedIndexChanged(sender,e):
    Label1.Text = e.Text
    pass