Can you try this approach for now ?!:
MainForm -> UniEdit1 -> ...
function afterrender(sender, eOpts)
{
var me=sender.inputEl;
me.set({
readonly: "readonly"
});
sender.addListener(
'focus',
function(sender, e, eOpts) {
me.el.dom.removeAttribute('readonly');
}
);
}
http://forums.unigui.com/index.php?/topic/8175-browser-promping-save-of-username-passwords/&do=findComment&comment=41783