How to change the FXIcon in a FXButton at runtime?

Dear all,

In the MainWindow::MainWindow (derived from FXMainWindow):
I create a FXButton and attach an FXIcon (icon1) to it:
    btn = new FXButton(hframe,
                         "",
                         getApp()->icon1,
                         this,ID_TRANSFORM,
BUTTON_TOOLBAR|FRAME_RAISED|LAYOUT_CENTER_X|LAYOUT_CENTER_Y,
                         0,0,0,0,0,0,0,0);

Further on (outside the MainWindow constructor), I would like to be able 
to change the icon (i.e. at runtime).
Then I try:
     btn->setIcon(getApp()->icon2);
but this does not work, a MsgBox with "FXDCWindow:drawicon: illegal icon 
specified" is shown, and then the program crashes.
Any idea how to change the FXIcon in a FXButton at runtime?

Best regards,
Pof



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