To reproduce:

• check out branch "radiobutton_crash" (adds an integer field to the UI)
• Build and run the cafTestApplication (release or debug, does not matter)
• Select the "ApplicationEnum" in the PdmTreeView
• Click on radio button T 3
• Click in the Integer Field Example field and change the value to 3
• Press the TAB button
• crash

Things work fine if changing the radio button editor type back to the old combo dropdown type.