and switch to the paren sheet from the context menu.
Mainly, change the way the dialog is managed from the sch_edit_frame:
the pointer to find the created dialog is replaced by a call to wxWidows::FindWindowByName().
Using a pointer set and cleared by events is a recipe for crashes.
ADD: User can now decide to keep the hierarchy navigator open while working
on a schematic.
This behavior can be configured in eeschema->preferences->eeschema->Editing options.