Resets all fields in this form. By default, any record bound by {@link #loadRecord}
will be retained.
@param {Boolean} [resetRecord=false] True to unbind any record set
by {@link #loadRecord}
@return {Ext.form.Basic} this
function(resetRecord) {
        Ext.suspendLayouts();

        var me     = this,
            fields = me.getFields().items,
            f,
            fLen   = fields.length;

        for (f = 0; f < fLen; f++) {
            fields[f].reset();
        }

        Ext.resumeLayouts(true);
        
        if (resetRecord === true) {
            delete me._record;
        }
        return me;
    }