Dolphin won't recognize Mouse button 4

[Maurdekye]

My mouse has five mouse buttons instead of the usual three, like some gaming mice. I configured my mouse to work like a makeshift wiimote, but for some reason Dolphin won't recognize my fourth mouse button,`Click 3`. I can bind any other action to Click 0, 1, 2 and 4, but it won't register when I click mouse 4. I even tried adding it manually as `Click 3` by right clicking on the box, and it did accept but still wouldn't recognize when I clicked.