This is so that an object will only be released when a weak-reference is 
used after the last weak reference has been released (either by 
CoReleaseMarshalData or CoUnmarshalInterface + Release).

ole32: Add a test for marshaling an object as table-weak and as normal and then unmarshaling and testing that the object is released on the final release.

Tests to validate return value of the LVM_GETORIGIN message and fix our
implementation.

The native control has a 2 pixel header. This implements that background pixel
line and the gridline below it.

Implement basic LVS_EX_GRIDLINES functionality including support for no items.

Take a reference to the ibasefilter and request it for the pins and a
cookie. This seems to be the easiest way to ensure correctness.