[SOLVED]Problem with Qt creator autocomplete code

[codek]

Hi all, im newbie on Qt and having problems with autocomplete code.
I see on videos how when ppl write "ui->label->" rhe autocomplete list shows up but it dosnt work for me. If i write "ui->" the lists appears then the autocomplete is working sometimes.. But not work for see the label or others objects from ui (like pushbutton).
I try with qt creator 2.7.x and 2.8.0, qt 5.1.0 on windows 8. I try compiling after i add the label with designer but it doesnt work.

Any idea? (Im sorry for my english)

EDIT:

I solved it reinstalling Qt SDK and selecting "Source componentes" checkbox. :) Regards