Descendent selector issue

[Harbs]

TitleBar has the following CSS in defaults:

TitleBar .TitleBarTitle {
        font-weight: bold;
        padding: 0;
        margin: 0;
}

This seems to cause the CSS to be always output even if TitleBar is not used.

Interestingly, the following CSS
ToggleTextButton.selected
{
        background-color: #d8d8d8;
        border: 1px solid #808080;
        padding: 4px;
}

does get omitted if ToggleTextButton is not used.

Is it correct to assume that this is a bug and if the parent/ancestor the 
selector is not used, the CSS should be omitted?

Harbs