extjs4.2 - How to change required field asterisk in ExtJs 4.2 -

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i need change position of asterisk indicator of required field (allowblank: false) before field label. imagem bellow:

enter image description here

i can't find proper way in sencha docs.

there similar question here, not work on extjs 4.2.

the bellow code snippet worked wanted to.

beforelabeltexttpl: [     '<tpl if="allowblank == false">',         '<span class="' + ext.basecssprefix + 'required">*</span>',     '</tpl>' ]

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