Layer lists need to be sorted alphabetically..

[meyco]

Except for the Layer Management window, layer lists are not sorted alphabetically.  In fact, they're not even sorted chronologically in the order they were created.  In my earlier post, I showed that my architectural drawings have 50 or more layers, making the task of assigning new objects to existing layers quite tedious.

[Yacine]

In Visio 2007 you can order the layers by clicking on the header of the layers name column.

[meyco]

That is true with 2010 and 2013 too I believe, but that option is not available on the "Assign to Layer" window.