Qcombobox automatically hidepopup?

  • qt version is 4.8.2, linux version is 2.6.39, one qcombobox was added to my project ,and I run it in ARM-LINUX , when press the qcombobox ,the down-drop showed up ,but after i release the qcombobox , the down-drop hided itself automatically , the focus policy was set as "ClickFocus" ... just so strange , I had used the qcombobox before ,but never met this .

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