[Qt-interest] size of QCheckBox

[Serge]

Hello,

i have list of frames.
each frame contains grid layout with widgets.
first column in grid - checkboxes with empty text label.

some frames must not contain checkboxes. just empty space.
if all cells in column are empty, grid layout makes it very narrow. But 
i need so that width of layout column without checkboxes would be the 
same as width of column with checkboxes.

How to make it?
I tried to make empty frames but they have not same size as checkbox?
How to make empty frame/widget with same size as QCheckBox?
If make temporary QCheckBox, get it size, and make frames using this 
size, it is incorrect.

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Serge