Irrlicht Engine

I have a 2D grid of squares. When I click the mouse I can easily determine which square the mouse was in with some division

Now I want to move to a 2D hexagon grid and be able to tell which hexagon the mouse pointer is in? How would I do this? Is there a formula for calculating this?

Thanx sdi2000 that solved my problem. My visibility flag wasn't being initialized in my constructors.

Put the irrlicht dll file in the same folder as your newly created .exe or in your windows\system32 folder.

I'm using Visual c++ 2005 Express and I've written a program using irrlicht. When I run the program from the IDE's debug menu (either with or without debugging) the program runs as expected but when I double click the exe the screen is black with the cursor but nothing else. currently I'm only using...

Thanx for the fast reply Acki but I mean to create my own GUI subsystem not use the build in one.

I want to create my own GUI in Irrlicht for a project I'm working on. Do I need to disable the default GUIEnvironment? Are there any tutorials about this?