I'm trying to fit a TreeView into a Combobox. There are already many threads which all refer to this blog post:
Unfortunately, the example is not working (anymore?) in WPF.
There seems to be a problem with the converter. In Silverlight, everything works fine, in WPF however, the converter is called, even when you open the DropDown (which does not happen in Silverlight). In this converter call, the "return false" condition is triggered and so the popup never opens.
Can you provide a new sample on how to fit a TreeView into a ComboBox (or DropDownButton)?