Make form readOnly/editable - except fields with property readOnly:true

[waken]

How make form readOnly/editable - except fields with property readOnly:true
ie. user "Edit" click makes some fieds on form editable, "Cancel" makes all fields readOnly
additional property to Ext.Field and function to Form.Basic?

[waken]

Nobody?

Solution, any comments?

Ext.override(Ext.form.field.Base,{
    readOnlyMy: false
}); 

HelperSetReadOnly = function(f, bReadOnly){
    
    if (f instanceof Ext.form.FieldSet) {            
        f.items.each(function (ff) {
            HelperSetReadOnly(ff);    
        });
    }
    
    if ((f.ReadOnlyMy == null) || (f.ReadOnlyMy == false))
        if (f.isFormField) {
            if (bReadOnly === true) {
                f.setReadOnly(true);
            } else {
                f.setReadOnly(false);
            }              
       }
}

Ext.override(Ext.form.Panel,{
    setReadOnly: function(bReadOnly) {
        this.items.each(function(f){
            if (f instanceof Ext.form.FieldSet) {                
                f.items.each(function (ff) {
                    HelperSetReadOnly(ff, bReadOnly);
                });
            }else{
                HelperSetReadOnly(f,bReadOnly);
            }
        });
    }
});