differences between fltk and qt

[Werner Koenig]

Hello List,

I want to query the mouse position in a graphic window. With the
graphics_toolkit fltk, I can do it with ginput, but with qt I get an
error

error: feval: function '__qt_ginput__' not found
error: called from:
error:   /opt/octave/share/octave/3.7.7+/m/plot/ginput.m at line 51, 
column 18

So I looked to the function __fltk_ginput__. When I imitate this 
function it works
fine with fltk, but with qt the property currentpoint of gca is always 
set to null.
How can I fix this problem.

So long Werner