I created xdp file. In that xdp file, I am using a image field object and a button. On click of that button, one can add a image in that area of the form. Using that xdp, I created a pdf. Everything works fine on the pdf. When the user clicks randomly at the bottom of the pdf, a cell is highlighted in light blue shade which similar to the size of the image that has been added. If I reduce the size of the image then shaded cell area also reduces. If I click again it goes away. I checked and found no other element in that area. I hope it is clear.