What I'm actually trying to do is to elaborate [this question][1]. I'd like to use `Pane` with scrollbars enabled to explore large (sparse) matrices like this one: ![enter image description here][2] Here is what I have so far using some ideas from [this answer][3]: A = ExampleData[{"Matrix", "HB/west0381"}, "Matrix"] // Normal; {n, m} = Dimensions@A; mp = MatrixPlot[A, ImageSize -> 9 m, Mesh -> All]; DynamicModule[{trans, ij, mpos}, trans[{x_, y_}] := {Clip[Floor[n - y] + 1, {1, n}], Clip[Floor@x + 1, {1, m}]}; Pane[ Show[mp, ImagePadding -> {{40, 20}, {20, 20}}, Epilog -> Text[ Framed[ Dynamic[(ij = trans@MousePosition["Graphics", {0, 0}]) -> A[[Sequence @@ ij]]], Background -> White], Dynamic[MousePosition["Graphics", {0, 0}]], {1, -1} ]~Style~Larger ], {500, 500}, Scrollbars -> True] ] The result is ![enter image description here][4] ------------------- **Now about the problems** **1.** The main trouble is that it does not correctly translate coordinates for horizontal scrolling. If we don't touch the horizontal scrollbar everything is fine: ![enter image description here][5] But if I slide horizontally the label shifts and falls outside the visible area. It looks like a Mma bug. **2.** The second funny thing is that if I remove `//Normal` from the first row then `MatrixPlot` produces the following: ![enter image description here][6] which seems to be the second bug. **3.** And finally the issue which is due to my confusion with `Dynamic` things. In the code I use `MousePosition["Graphics", {0, 0}]` twice (can this be the reason for the item 1 from above?). When I tried to save this coordinates in a variable I had no luck. But there must be a way to do this. ---- Any suggestions? [1]: http://mathematica.stackexchange.com/q/2512/219 [2]: https://i.sstatic.net/X6rNA.png [3]: http://mathematica.stackexchange.com/a/2524/219 [4]: https://i.sstatic.net/SLaS3.png [5]: https://i.sstatic.net/RP8aZ.png [6]: https://i.sstatic.net/JIChf.png