spin box:
-   on vista+: drawing bug when resized in reaction to clicking the up button
-   doesn’t look good on Win32s/NT3.51

ui generator:
-   make generator creating code from XML UI file
-   can this be implemented as XSLT?

message dialog:
-   do text wrapping with maximum width

accessibility

OLE/ActiveX control support

resize/layouting performance
-   do some profiling to identify bottlenecks