How to hide column in Cell table GWT?

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.

Well you could try to use fixed layout for the CellTable and set the width of the specific column you want to hide to 0px. I did use another approach.

In my case I have a cellTable which should display a checkbox column as soon as I press a button (which puts the celltable in edit mode). I do this by creating a CheckBoxColumn and inserting and removing it when I press on the button. It looks seomething like that:

@Override
public void insertCheckBoxColumn(Column<Object,Boolean> column) {
    if (cellTable.getColumnIndex(column) == -1) {
        cellTable.addColumn(column,"");
        cellTable.setColumnWidth(column,50, Unit.PX);
    }
}

@Override
public void removeCheckBoxColumn(Column<Object, Boolean> column) {
    int index = cellTable.getColumnIndex(column);
    if (index != -1)
         cellTable.removeColumn(index);
}

However note that you might run into this issue on google chrome.