Thanks a lot for the quick reply. I made openParent a public member, but the following code does not work:
if ( !sd.vwd()->isRoot() )
Maybe I used this procedure in a wrong way. What would be a proper way to call "openParent"?
I am working on a file selection box (LCD), where the user should be able to navigate through the folder hierachy. For this purpose my idea was to modify "vwd".