Thanks for answer, I know that to put a value in a texteditor I must use setValue, but when a texteditor is inside a form, and DATA is a json with all fields from form, the method .form('load',DATA) fulfill all fields but not fields with texteditor.
When you define your form, you could automatically call setValue on load success event. Like this:
$('#myform').form({
onLoadSuccess: function (data) {
$('#te').texteditor('setValue',data.fieldName);
}
});