User-Agent:       Mozilla/5.0 (X11; U; Linux i686; zh-CN; rv:1.8.1.3) Gecko/20070322 Firefox/2.0.0.3
Build Identifier: 

Open thunar, do some right click on a item some times. the popup menu will just flash once, then disappear, I even can not get the menu item to choose.
But when you right click on the empty area, works fine

Reproducible: Always

Steps to Reproduce:
1. Choose a item , right cliicck on it.
2. if it popup the  menu, then choos e another item to right click
3.

Actual Results:  
The popup menu disappeared automactically without I choose the menuitem

Expected Results:  
Popup menu pops and stay on the screen, let me choose the item then disappear.