WPF:当IsMouseOver ComboBoxItem时启动代码

I have a ComboBox. Without changing the template, is there a way that I can launch code when there user places their mouse over a ComboBoxItem, but before the selection actually occurs? It seems like I should be able to specify an EventTrigger or a Trigger to do this in the style of ComboBoxItem.I have a ComboBox. Without changing the templat