如何在WPF ComboBox中正确显示太长的文本

I have a ComboBox that shows text of various lengths. For texts that are not long there is not a problem. For the texts longer than the width of ComboBox I would like to trim the text and add "..." (an ellipsis) at the end to show them properly. The bottom line is that I don't want to change the width of the ComboBox. Does anyone know how to do this?I have a ComboBox that shows text of various le