Wikitude

Custom Wikitude Studio

I have created my own drag and drop interphase which i would like to use with wikitude for triggers. I have been researching on how Wikitude gets the position of the triggers on their drag and drop interphase. I have created a AR app with Wikitude which compliments the drag and drop interphase. I just wanted to know how will i get the triggers to desplay on the right position when aurgmented. I understand that Wikitude uses SDU's but in my drag and drop how will i get the position of the triggers ? currently i get the position in pixels and they are not relative to the target. Please Help.