Pressing the ENTER key is the default selection mechanism for a Combo widget.
Run the folowing example and hit ENTER - you should see the message "Default Selection occurred" printed to the console:
public static void main (String [] args) {
Display display = new Display ();
Shell shell = new Shell (display);
Combo combo = new Combo(shell, SWT.NONE);
combo.add("a");
combo.add("b");
combo.add("c");
combo.add("d");
combo.setBounds(10, 10, 200, 40);
combo.addSelectionListener(new SelectionAdapter() {
public void widgetDefaultSelected(SelectionEvent e) {
System.out.println("Default Selection occurred");
}
});
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
}