Provide a straight-forward option for customers to set their custom tooltip. An example showing how to achieve this now is available at https://github.com/telerik/xaml-sdk/tree/master/PropertyGrid/CustomHyperlinkToolTip

The problem should be resolved with R2 2016. 

The fix is available with lib version 2015.2.907.

Fixed with LIB version 2015.2.817.

Research the opportunity to add support for TypeConverter on class.

Available in the 2017 R1 Release (2017.1.117).

It should be a themable editor which allows users to select a file or a directory from the file system using OpenFileDialog, FolderBrowserDialog or directly to type the full path to the file.