public <T extends Widget & Checkable> boolean uncheck(T checkableWidget) {
        if (hasChild(checkableWidget)) {
            return checkInternal(checkableWidget, false);
        }
        return false;
    }
public < T extends Widget & Checkable > boolean uncheck ( T checkableWidget ) { if ( hasChild ( checkableWidget ) ) { return checkInternal ( checkableWidget , false ) ; } return false ; }
Set the specified {@link Checkable} {@link Widget} as unchecked, if it is a child of this
{@link CheckableGroup} and not already unchecked.
@param checkableWidget The {@code Checkable Widget} to
{@linkplain Checkable#setChecked(boolean) set unchecked}.
@return {@code True} if {@code checkableWidget} is a child of this {@code CheckableGroup} and
was not already unchecked; {@code false} otherwise.