//Stores slide-size crop of the current slide as a global variable
        private void AddZoomSlideCroppedPicture(float magnifyRatio = 1.0f)
        {
            PowerPointSlide zoomSlideCopy = this.Duplicate();

            Globals.ThisAddIn.Application.ActiveWindow.View.GotoSlide(zoomSlideCopy.Index);

            Shape cropShape = zoomSlideCopy.Shapes.AddShape(Office.MsoAutoShapeType.msoShapeRectangle, 0, 0, PowerPointPresentation.Current.SlideWidth - 0.01f, PowerPointPresentation.Current.SlideHeight - 0.01f);

            cropShape.Select();

            Selection sel          = Globals.ThisAddIn.Application.ActiveWindow.Selection;
            Shape     croppedShape = CropToShape.Crop(zoomSlideCopy, sel, magnifyRatio: magnifyRatio);

            zoomSlideCroppedShapes = GraphicsUtil.CutAndPaste(croppedShape, _slide);

            zoomSlideCroppedShapes.Name = "PPTLabsMagnifyAreaGroup" + DateTime.Now.ToString("yyyyMMddHHmmssffff");
            ShapeUtil.FitShapeToSlide(ref zoomSlideCroppedShapes);
            zoomSlideCopy.Delete();
        }