UI file showing different in desktop and laptop ..

Hii
In my project one ui file is there , when i am viewing that ui file in my laptop( having 15 inch screen ) half of the ui file is not showing , when i am running the same project in my desktop(having bigger screen than my laptop) the same ui file is showing completely . What might be the reason and how to show the full ui in my laptop ??
Thankxx in adv ..

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Added after 1 5 minutes:

i got the solution , i just decrease the heigt of my UI file . Now its working fine both in my desktop as well as in my laptop ..

use------>

Code:

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this->setFixedSize(w,h);

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Use a layout so that widgets resize correctly.