[21.0b62] mouse copy and paste on NT4.0

Hi I have built Xemacs 21.0b62 on NT 4.0. All works fine except the mouse binding. I can highlight a region with the left button of the mouse. But if i try to paste the selection with the middle button, nothing appears in the buffer. But I have the following error message in the minibuffer: "Kill ring is empty" When I use C-Insert after highlighting the region, paste with the middle button works fine. How can I change that the highlighted region is in the kill ring? Roger -- Lieber wenige Programme die laufen als viele die abstuerzen! (Ein gluecklicher SUN-user ;-) Aber zuhause hat man ja Zeit zum Basteln.