I move the cursor with the keyboard to that location. And press the context/menu-key on the keyboard. (Don't use the mouse)
The menu with the suggested words don't appear at the caret position it appears at the top of the screen.
The problem seams to be that the point coordinates of the WM_CONTEXT message is not checked. Typically for a keyboard input the coordinates are -1,-1. ;)
Martin Richter [rMVP] WWJD http://blog.m-ri.de "A well-written program is its own heaven; a poorly written program is its own hell!" The Tao of Programming