Browser document Mode in Custom Framework works partially.

Hallo.

In our custom Framework, I have the iview "Browser Document Mode"

Property "Browser Document Mode"="IE=EmulateIE7"

When I browse in the portal, it works and if I search the document mode, using,the Internet Explorer developer tool, I see:
"Non-standard IE 5 Document type" and it works right.

When I open a km news to create a new one, it opens a separate page, and it doesn't work well.

I see : "Non-standard Document type" and it dosen't work well when I browse in km folder.

If I force "Non-standard IE 5 Document type"

How can I solve it ?

Could you jelp me?

Thanks a lot.

Mario