Earlier I asked how I could manage events on forms.
I think I have solved that because now I can trigger a function based on the event.

My problem now is how can I reference form components from that function.

I use this to manage events:

Ext.EventManager.on("tipo_id1", 'click', handleCargacomboBox_1);

So, I have the function 'handleCargacomboBox_1' where I want to work and alter form elements.
The problem is that I don't know how to do it.

This is the beggining of my function:

function handleCargacomboBox_1(radio)
var rd = radio.getTarget();

If I output 'rd' with an alert I can get the correct element id but nothing else.