Only create the histogram once the user clicks the "histogram" tab
[1452]
Actually call finishHistogramStuff...[1452]
Just code cleanup... removing commented out code, renamed
finishHistogramStuff, updating javadoc. [1452]
Check for Histogram tab explicitly instead of assuming it's at index 1  [1452]
Show the wait cursor while making histogram [1452]
Merge pull request #62 from mhiley/histo

[1452] Only create the histogram once the user clicks the "histogram" tab