Fixing issue with showing bottom columns when the number of hidden columns exceeds the vertical screen

Issue:

TIBCO JasperReports^® Server allow to hide table report columns if required, so you can exclude from exporting unnecessary table columns.

As a part of this functionality, it allows to show previously hidden colums, which are listed as dropdown menu, after clicking Show Columns:

The problem comes if you have a lot of columns to hide and drop down menu becomes bigger. If it gets bigger height, it can get invisible for user to choose. The problem is clear on sceenshot below.

Resolution:

At this moment, it is a known issue, which will be fixed in future releases. Meanwhile, the possible solution would be to apply specific styling for this drop down, used in Show columns tab:

ul.pmenu { 
    display: none; 
    max-height: 200px; 
    max-width: 300px; 
    overflow: hidden auto; 
    top: 161px; 
    left: 150px; 
}

I did it by creating new overrides_custom.css file with these styles and reapplying it to theme (pods_summer in example). Provided workaround works in Chrome, but not in Internet Explorer as style selectors are a bit different for IE 10, 11.

ul.pmenu { 
    -ms-overflow-y: auto; 
    max-height: 300px; 
    max-width: 300px; 
}

Confirmed as viable solution for JasperReports^® Server 6.4.3