Cannot Center In A Columnlayout

[oodini]

Hello,

I defined a columnLayout, and I want its children center in it :

CODE
columnLayout -backgroundColor 0.2 0.8 0.2 -columnAlign "center";
    text -label "foo" -align "center" -height 5;
    columnLayout -backgroundColor 0.2 0.8 0.8 -columnAlign "center";
    ...
    setParent..;
setParent..;

The problem is that the text and the second columnLayout are not centered in the first columnLayout, and I don't understand why... What are the possible causes ?

Thanks.