Interactive Report Header problem with multiple lines

Von Tobias Arnhold 2.28.2011
There is a bug/misbehavior inside the IRR column headers in APEX 4. When you create column names with linebreaks (using the <br> tag) inside then the background color changes to a grey background on the second line.
Workaround: Add this script to your IR region header:
/* IRR Header Fix */
.apexir_WORKSHEET_DATA th{background-color:#828282!important;}

Bug view:

Fixed view:

There is a forum entry as well: