Win32 custom (pixbuf) cursors reverting to standard pointer on left/right click

[Jason Compton <jcompton planewalkergames com>]

We have an application using GTK (2.10.12 DLLs) and have encountered a 
problem with custom cursors.

On the Linux and OSX/X11.app builds of the game, the pixbuf cursors 
correctly remain on the screen when the mouse is right or left-clicked.

On Win32, the pixbufs revert to the standard Windows pointer for the 
duration of the click, returning to our custom pixbuf only when the 
mouse button is released. Our developer is unclear as to the source of 
the problem since the X11 behavior is correct.

Is this a common mistake with a straightforward workaround? It does not 
seem to be a limitation of GTK on Win32 as GIMP on Win32 maintains its 
custom draw tool cursors during left-click-and-drag, etc.

Any insight would be greatly appreciated.