Merge pull request #628 from bgraner/master

Fixed issue where trying to reload a cell that is inside a hidden sectio...
If setting images for items in QRadioElement, 
display them in QRadioItemElement.
Merge pull request #638 from bvirlet/master

Improve us of images in QRadioElement
Adds back the delegate class so we can overview when cells and headers appear
Minor UI updates to cells
Minor fixes to binding evaluator