Zooming while drawing a line

Hi, I have problem with zooming while drawing a line. When I scroll the mouse it doesn´t zoom. I have to end the line and then zoom.

Can anyone help me what to do to zoom (sroll) WHILE drawing the line (or cropping).
When tried Corel x3 I did´t have problem...please could you help me?
I have Corel Home and Student X7.
Thank you very very much...

Veronika