I need help to find out, how Dictionary app showing following popup dialog for selected text on pressing CMD+CTRL+D on any application. I want to implement
the same kind of functionality for my cocoa app, where my app will run in background and showing suggestions on some hot key press for the selected text.

![Dictionary app hot key suggestion dialog](https://i.stack.imgur.com/3EqzF.png)

I have already implemented hot key capturing, i just need to have code to get the rectangle area of selected text on screen, so i can show the dialog like dictionary app.

Thanks