checkBoxcell checked -> unchecked

I'm sorry.. I can't write English..

I make cellTable..

when button click all checkboxcell is uncheck..

↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓ image url.. ↓↓↓↓↓↓↓↓↓↓↓↓
http://postfiles10.naver.net/20101229_73/isotone_12936152462850Ouse_PNG/ask.png?type=w3

It's very hard...

↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓ source code ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
table = new CellTable<Contact>();
TextColumn<Contact> nameColumn = new TextColumn<Contact>() {
@Override
public String getValue(Contact object) {
return object.name;
}
};
final CheckboxCell cCell = new CheckboxCell(false, true);
final Column<Contact, Boolean> checkColumn = new Column<Contact,
Boolean>(cCell) {
@Override
public Boolean getValue(Contact object) {
// Get the value from the selection model.
return selectionModel.isSelected(object);
}
};
table.setSelectionModel(selectionModel);
selectionModel.addSelectionChangeHandler(
new SelectionChangeEvent.Handler() {
public void onSelectionChange(SelectionChangeEvent event)
{
Contact selected =
selectionModel.getSelectedObject();
}
});
table.addColumn(checkColumn);
table.addColumn(nameColumn, "Name");
table.setRowCount(CONTACTS.size(), true);
table.setRowData(0, CONTACTS);
Button btn = new Button("clear");
btn.addClickHandler( new ClickHandler() {
public void onClick(ClickEvent event) {
Boolean f = new Boolean(false);
// for ( int i = 0; i < table.getRowCount(); i++ ){
// Context context = new Context(i + table.getPageStart(),
0, checkColumn);
// cCell.render(context, f, new SafeHtmlBuilder());
// }
}
}) ;

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