QScrollArea and layouts

[jesse_mark]

Hello all,

I would like if anyone can explain to me
why in the designer and when using the QscrollArea the scroll bar are not shown, but when i run it the widget looks smaller and the scrolls are shown.

what i have tried :
Fix the size (width and height)
Setting the size policy to fixed (Horizontal and vertical)
change the layout margin of the group-box, where i have the scrollArea placed, and set all of them to zero.
, but still the same happen.

I have :
A group-box with a grid layout
then I places a scroll area on it with a grid layout as well
then places my other widget buttons, labels and lineEdit

see attachment for a pic in designer and in run time.