Adds an annotation to the page at the specified position.
At this time, only patSquare or patCircle should be adding using this method.
The second overload initialize the annotation with a border and fill of the specified color and transparency
// Add an ellipse to the page (blue border and half-transparent red fill) ImageEnView1.PdfViewer.Annotations.NewAnnotation( R, patCircle, TColor2TRGBA( clBlue, 255 ), TColor2TRGBA( clRed, 125 ));
// Add an rectangle to the page (green border and yellow fill) ImageEnView1.PdfViewer.Annotations.NewAnnotation( R, patSquare, TColor2TRGBA( clGreen, 255 ), TColor2TRGBA( clYellow, 255 ));