I have a couple of manually populated comboboxes that most of the time behave normally. Sometimes, when the form enters Edit mode the dropdown element on the controls disappears and the controls effectively look like text boxes with no dropdown list.

Most of the time the controls work and there doesn't appear to be a reason or pattern to when they fail. The combobox always looks okay when the business object is idle - it just happens when the business object enters edit mode.

Has anyone seen this before?

Thanks,

Aaron