i added a qtablewidget (parent is tabwidget)to my GUI and added number of rows and columns to it .Then i go to the Properties tab;populate the  "Header " under the properties tab. i dont require header to be visible and  so i unchecked my horizotalheadervisible checkbox. now if i want to use header and again check the box ,  every time when i compile i end up getting error message saying "C:\Users\Reena\Desktop\svn_lattice\code\ui_pcie_devicelist.h:138: error: C2039: 'setTabBarAutoHide' : is not a member of 'QTabWidget'" that redirects me to Ui file .if i rebuild all then it asks "the file is removed do u want to save it "?  still get the error .i have attached a file