GUI.DrawTexture overlay behind a gui.window - stop input events propagating through

Hello,

I have an in-game pause menu all designed etc using unity's gui. Behind the pause menu I drew a 1x1 semi transparent texture (texture is just a black 1x1 png stretched to fill screen).

Problem is, click events (I'm assuming touch events too) pass right through the texture. This is a big issue for me, does anyone know a way around this problem?

I have tried GUI.ModalWindow and it does prevent clicks on other gui elements underneath the overlay, but for some reason other game pieces are still clickable.

Code (csharp):

1.  
2.             GUI.color = new Color(GUI.color.r,GUI.color.g,GUI.color.b,pauseAlpha);
3.             GUI.DrawTexture(new Rect(0, 0, Screen.width, Screen.height), fadePixel);
4.                         // restore alpha to rest of gui
5.             GUI.color = new Color(GUI.color.r,GUI.color.g,GUI.color.b,GameScreens[0].Alpha);
6.