user interface - How to get what mouse button was pressed in EventHandler?

I'm trying to make an interface that (basically) records what mouse button was pressed inside the cell of a matrix.

The code I have so far is

A = ConstantArray[0, {10, 10}];

DynamicModule[{pt = {0, 0}}, Dynamic@EventHandler[ArrayPlot[A],
   "MouseDown" :> (
     A[[
        Ceiling[10 - MousePosition["Graphics"][[2]]],

        Ceiling[MousePosition["Graphics"][[1]]]
      ]] = CurrentValue["MouseButtons"])]]

It kind of works, except that CurrentValue["MouseButtons"] seems to be returning strange things: it returns {1} for my left mouse button, empty set {} for my right mouse button, and nothing happens when I click my scrollwheel/middle mouse button. Why is that? Shouldn't I be getting something like 1 for left mouse, 2 for right mouse, and 3 for middle mouse buttons (at least according to the documentation)? My mouse seems to be working fine.

Thanks for any help!

Comments

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