将元素动态添加到formField Extjs 2的问题

I Have a fieldset inside a FormPanel. I am adding an element to 'fieldset' dynamically. But this element is getting added at the bottom of 'fieldset'where as I want to add this element as a first element of my 'fieldset' i.e. on the top. How can I do that? Can someone help me?I Have a fieldset inside a FormPanel. I am addi