Custom cursor in VTK window


I have a WPF application where one of its controls is hosting a VTK window. I want to set the icon of the mouse cursor to any image I want (for example, a magnifying glass to represent a zoom action). I have tried to do this from WPF side but when I hover the VTK window the cursor icon changes to VTK default cursor. I have also tried to set a custom icon from VTK side, but it appears that I can only choose among a small set of predefined cursors. Do you know how can I set a custom cursor for VTK?

Thanks in advance!

Any help for this?