on Windows, make sure that Types tree items are selected when right-clicked.
This fixes a bug where the wrong element can be deleted.
../PLCOpenEditor.py
../PLCGenerator.py
../PLCControler.py
../RessourceEditor.py
../Viewer.py
../TextViewer.py
../SFCViewer.py
../LDViewer.py
../GraphicViewer.py
../Dialogs.py
../DataTypeEditor.py
../plcopen/iec_std.csv
../plcopen/plcopen.py
../plcopen/structures.py