Moved to .NET 4.5.1 (convenient to use with [CallerMemberName] using)
Fixed issues with WPF ComboBox in UIA v3.
Added some useful info to log (required .NET 4.5 to run as it is using [CallerMemberName])
Partial solution for WinForms ComboBox.

For some reason, in UIA v3 ComboBox doesn't expose ExpandCollapsePattern. Instead it has button "Open" which can be clicked. This change abstracts required changes away.