This GUI Magnifier control appears either in a separate, stationary window, or as a pop-up area within the ImageGear.Windows.Forms.ImGearPageView window. When the GUI Magnifier control is active, and the user drags the mouse within the ImGearPageView control, the magnified display of the image tracks the location of the mouse. If the pop-up view is used, the magnified display of the image tracks the mouse within the ImGearPageView control. If the separate, stationary window is used, the area of the image that is displayed in the floating window is displayed in reverse video in the ImGearPageView control. The programmer can set the magnification factor, and can optionally expose that capability to the end user.

Reference

ImGearMagnifierCtl Members
ImageGear.WPF Namespace
ImGearPageView Class