- the main issue was the modules that I imported. It was the FlatCAMObj.py

modules which it was not what it was needed. I changed the imports to
camlib.py, remade the functions in camlib.py and now the Flip, Rotate
and Skew work over all the objects of FlatCAM (Gerber, Geometry created
by the FC, Geometry created by the objects, Excellon, CNCJob)

ToolTransform.py

@@ -2,7 +2,7 @@ from PyQt4 import QtGui, QtCore
 from PyQt4 import Qt
 from GUIElements import FCEntry, FCButton
 from FlatCAMTool import FlatCAMTool
-from FlatCAMObj import FlatCAMGerber, FlatCAMExcellon, FlatCAMGeometry
+from camlib import *
 
 
 class ToolTransform(FlatCAMTool):
@@ -224,7 +224,7 @@ class ToolTransform(FlatCAMTool):
                 self.app.inform.emit('Object was rotated ...')
             except Exception as e:
                 self.app.inform.emit("[ERROR] Due of %s, rotation movement was not executed." % str(e))
-                return
+                raise
 
     def on_flip(self, axis):
         obj_list = self.app.collection.get_selected()
@@ -276,7 +276,7 @@ class ToolTransform(FlatCAMTool):
 
             except Exception as e:
                 self.app.inform.emit("[ERROR] Due of %s, Flip action was not executed.")
-                return
+                raise
 
     def on_skew(self, axis, num):
         obj_list = self.app.collection.get_selected()
@@ -314,6 +314,6 @@ class ToolTransform(FlatCAMTool):
                 self.app.inform.emit('Object was skewed on %s axis ...' % str(axis))
             except Exception as e:
                 self.app.inform.emit("[ERROR] Due of %s, Skew action was not executed." % str(e))
-                return
+                raise
 
 # end of file