How to hide column in Cell table GWT?

[Sanjay Jain India]

I am using Cell Table in GWT.In that cell table I am adding these
columns.

   TextColumn<Document> idColumn = new TextColumn<Document>() {
        @Override
        public String getValue(Document object) {
            return Long.toString(object.getId());
        }
    };
    TextColumn<Document> refColumn = new TextColumn<Document>() {
        @Override
        public String getValue(Document object) {
            return object.getReferenceNumber();
        }
    };
    /*
     * DateCell dateCell = new DateCell(); Column<Contact, Date>
dateColumn
     * = new Column<Contact, Date>(dateCell) {
     *
     * @Override public Date getValue(Contact object) { return
     * object.birthday; } };
     */
    TextColumn<Document> nameColumn = new TextColumn<Document>() {
        @Override
        public String getValue(Document object) {
            return object.getDocumentName();
        }
    };
            table = new CellTable<T>();
    table.addColumn(idColumn, "Id");
    table.addColumn(refColumn, "Reference Number");
    table.addColumn(nameColumn, "Name");
}

Now I have some queries: How to hide the id column?
On click of row how can i get the from selected row?
Please help me out. Thanks in advance.

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