ACT_ADD_STEP = 200
ACT_REM_STEP = 201
ACT_ADD_TRANS = 202
ACT_REM_TRANS = 203
ACT_ADD_CONNECT = 204
ACT_REM_CONNECT = 205
ACT_EDIT_PROP = 206
UNDO = 207
REDO = 208
SV_RECIPE = 209
EXIT = 210
HELP = 211
ABOUT = 212
LAY_ONE = 213
LAY_TWO = 214
LAY_THREE = 215
LAY_DEFAULT = 216
ACT = 300
