How do I let the mouse pointer not enter a widget?



Hi,  
  I have a question during the development using gtk2.0.
  How do I let the mouse pointer not enter a widget(such as button etc.)? I look for the gtk api, but no functions show to do that.I want to try  get enter event, but do not know how to set the mouse pointer in widget.
  Please give me reply.
  Thank you very much.
Regards
 Zhuj


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