The patch to implement: Validate properties specified for sorting and grouping in index views. Original patch from martin.v.loewis via: https://hg.python.org/tracker/roundup/rev/439bd3060df2 Applied by John Rouillard with some modification to properly identify if the bad property is a sort or grouping property. Tests added. has an issue with the current code base. Apparently sometime it can be entered without self.classname being defined. As a result the property lookup fails. So guard it by checking for self.classname in a couple of spots and if self.classname is not set just append the property and let the target action sort it out.

//
// Accordion
// --------------------------------------------------


// Parent container
.accordion {
  margin-bottom: @baseLineHeight;
}

// Group == heading + body
.accordion-group {
  margin-bottom: 2px;
  border: 1px solid #e5e5e5;
  .border-radius(@baseBorderRadius);
}
.accordion-heading {
  border-bottom: 0;
}
.accordion-heading .accordion-toggle {
  display: block;
  padding: 8px 15px;
}

// General toggle styles
.accordion-toggle {
  cursor: pointer;
}

// Inner needs the styles because you can't animate properly with any styles on the element
.accordion-inner {
  padding: 9px 15px;
  border-top: 1px solid #e5e5e5;
}