Some problems with ties

[Robert Clausecker]

I tried to tie some notes together wichs are in different Voices. That
failed. Maybe somebody could help me. This is the score:

\relative a' {
        <a c a'>16 <c c'>8 <h g'>16 ~ << { g' c, d e } \\ { h8 h } >>
}

Additional, the "||:" bar behaves remarkable: In a piano staff, it
creates two dots in the center between the two staffs and also at the
center of the two staffs:

\new PianoStaff { <<
        \new Staff { e2' a' \bar "||:" g1 }
        \new Staff { d d d d e g e g }
>> }

Yours, Robert