Kestrel Fcs_M on Solaris

All items of Choice can not be displayed when the size of Choice is
larger than the screen size because many items in it.

On the other hand, Choice on Windows can be displayed well
even if many items are in it because a scroll bar is provided.

To reproduce,

1)Compile and run the attached program on Solaris.

2)Click the Choice menu.

3)Choice can not be displayed completely.