I create a radioCell class as follow:
public class RadioCell extends CheckboxCell {

/**
* An html string representation of a checked input box.
*/
private static final SafeHtml INPUT_SELECTED =
SafeHtmlUtils.fromSafeConstant("<input type=\"radio\" name=\"selected
\" tabindex=\"-1\" checked/>");
private static final SafeHtml INPUT_UNCHECKED =
SafeHtmlUtils.fromSafeConstant("<input type=\"radio\" name=\"selected
\" tabindex=\"-1\"/>");
@Override
public void render(Context context, Boolean value,
SafeHtmlBuilder sb) {
// Get the view data.
Object key = context.getKey();
Boolean viewData = getViewData(key);


if (value != null && value) {
sb.append(INPUT_SELECTED);
} else{
sb.append(INPUT_UNCHECKED);
}
}

}

everything is ok, when I select a radiobutton, it will be selected.
now I want to add a button and when press this button, it will give me
the selected record, I plan to use
SingleSelectionModel.getSelectedRecord(), and the following is the
selectionmodel:
final SingleSelectionModel<Log> singleSelectionModel = new
SingleSelectionModel<Log>(keyProvider);
singleSelectionModel.addSelectionChangeHandler(new
SelectionChangeEvent.Handler(){
@Override
public void onSelectionChange(SelectionChangeEvent event) {
// TODO Auto-generated method stub

singleSelectionModel.setSelected(singleSelectionModel.getSelectedObject(),
true);
table.redraw();
}});

table.setSelectionModel(singleSelectionModel);

but now a very strange thing occur, when I select a radiobutton in a
row of the table, the radio button will not selected, I need press the
radio button once more to get it selected, before adding the
singleselectionmodel,
no this problem occur!!

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