bBrowser problem with multiple selected lines

Hi to everyone.
I have a problem with bBrowser3. I issue a command:
oBrowser:SelectionMode := #Single

but I can still select multiple lines in bBrowser, if I press Ctrl or
Shift 
keys. How can I do this way that I can select only one line, even pressed 
Ctrl or Shift keys?

Thank you,

Sandi