stylesheet and namespace

hi,
I am having a problem while stylesheet For ex:-the below structure says A is namespace with B and D as child namespace.So when i am using E instance in C and i want to apply certain styles to this instance i have a file which sets the style sheet now the problem is the style sheet is not set for my class E

A
|
|_B
| |
| |_C
|_D
|
|_E

my file stylesheet.css:-

A--B--C A--D--E#objectName
{
background-color:red;
}

the file is reading correctly because instead of E class if i give widget it works well but with namespace it doesnt work ( following works well).

A--B--C QWidget#objectName
{
background-color:red;
}