add a new row consisting of 2 combobox ,1 textfield and a button to panel in EXTJS

Question

On cliking on the button the whole row should get duplicated.

Here is what I have done using normal JavaScript :

You can check the working of below code here ---> Duplicate the Row

function addRow() { var dataval= document.getElementById("dup").innerHTML; var x=document.getElementById('table').insertRow(0); x.innerHTML=dataval; }

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I want to build this kind of example on the panel in EXTJS. plzz help !!! I am just a beginner of EXTJS.[link text]