When trying to add the element in the detail band, the Pentaho Report Designer GUI breaks .
Steps to replicate.
1. In the Details section create a Band and add few elements to the band.
2. Now right-click on the Details layout or on the Structured Tab and try to add the element, the Pentaho Report Designer breaks.
Please refer the attached .prpt report file and the animated .gif file. I am also attaching the log.