I've find next problem, when open style by Ctrl+Lmouse click:
a) try to open "style1" in <div class="style1"> - it works correctly;
b) try to open "style2" in <div class="style2"> - it does not work;
I've try to investigate and find for case (b) in somefile.css we have next definition:

.event .evt_sub .style2

{float:left; margin-right:10px}

.event .evt_sub .style2 strong

{display: inline-block; width: 51px;}

.event .evt_sub .style2 span

{border-right:1px solid #ccc;padding-right:7px;margin-right:7px}

if we change it to:

.style2 .event .evt_sub

{float:left; margin-right:10px}

.style2 .event .evt_sub strong

{display: inline-block; width: 51px;}

.style2 .event .evt_sub span

{border-right:1px solid #ccc;padding-right:7px;margin-right:7px}

in case (b) open functionality start to work correctly.

So VPE can not open css file, if the style is not on the first place.