Having Trouble Ripping Sega CD Sprites

So, yesterday, I finally managed to install a Genesis Emulator that works on my operating system.

I decided to rip some sprites from a Sega CD game (I had followed a tutorial on this site earlier.). So I started the game, got to where I wanted to rip the sprites, paused the game, opened up "CPU->Debug->Genesis->VDP", and I got to the VDP Screen: on the left is all the game's tiles, and in the right-hand corner is the palettes. Pretty basic, right? Well, here's the problem:

I can't click on anything.

I tried clicking on another palette to change the color of the tiles-nothing. I tried scrolling the tiles-nothing. I literally cannot do anything on this screen except for changing to another debug menu! Could someone please help me?

P.S: I'm using Gens11b

EDIT: In order to help you guys understand my problem, here's an screenshot showcasing what exactly the screen looks like when I enter the VDP.