private void btnCreateCaptionStep_Click(object sender, EventArgs e)
{
if (_presentation != null)
{
_presentation.CreateCaptionStep(gviPresentationStepContinue.gviPresentationStepContinueWait, 2, "", "当前是第" + _presentation.Steps.Count + "个step，当前时间是:" + DateTime.Now, -1, _presentation.Steps.Count);
}
}