del.CompoundEventSelectionState;

  function createModel(opt_customizeModelCallback) {
    return TestUtils.newModel(function(model) {
      model.p1 = model.getOrCreateProcess(1);
      model.t2 = model.p1.getOrCreateThread(2);

      model.s1 = model.t2.sliceGroup.pushSlice(TestUtils.newSliceEx({
        title: 'a', start: 10, end: 20
      }));
      model.s2 = model.t2.sliceGroup.pushSlice(TestUtils.newSliceEx({
        title: 'b', start: 20, end: 30
      }));

      model.ir1 = new tr.model.um.StubExp