diff --git a/invesalius/control.py b/invesalius/control.py
index 40c4b7d..84a0f08 100644
--- a/invesalius/control.py
+++ b/invesalius/control.py
@@ -630,4 +630,4 @@ class Controller():
 
     def ShowBooleanOpDialog(self, pubsub_evt):
         dlg = dialogs.MaskBooleanDialog(prj.Project().mask_dict)
-        dlg.ShowModal()
+        dlg.Show()
diff --git a/invesalius/data/cursor_actors.py b/invesalius/data/cursor_actors.py
index 5dba5f9..657de4b 100644
--- a/invesalius/data/cursor_actors.py
+++ b/invesalius/data/cursor_actors.py
@@ -312,8 +312,6 @@ class CursorCircle(CursorBase):
 
         y,x = numpy.ogrid[yi:yf, xi:xf]
 
-        print "AREA", x
-
         index = (y*sy)**2 + (x*sx)**2 <= r**2
         self.points = index
 
diff --git a/invesalius/data/slice_.py b/invesalius/data/slice_.py
index b3b3008..4101cbb 100644
--- a/invesalius/data/slice_.py
+++ b/invesalius/data/slice_.py
@@ -370,7 +370,6 @@ class Slice(object):
         # "if" is necessary because wx events are calling this before any mask
         # has been created
         print "__show_mask"
-        print "self.current_mask", self.current_mask
         if self.current_mask:
             index, value = pubsub_evt.data
             self.ShowMask(index, value)
@@ -805,7 +804,6 @@ class Slice(object):
         """
         self.current_mask.was_edited = False
         thresh_min, thresh_max = threshold_range
-        print "Threshold"
 
         if self.current_mask.index == index:
             # TODO: find out a better way to do threshold
@@ -817,7 +815,6 @@ class Slice(object):
                     m[m == 1] = 255
                     self.current_mask.matrix[n+1, 1:, 1:] = m
             else:
-                print "Only one slice"
                 slice_ = self.buffer_slices[orientation].image
                 self.buffer_slices[orientation].mask = (255 * ((slice_ >= thresh_min) & (slice_ <= thresh_max))).astype('uint8')
 
@@ -873,7 +870,6 @@ class Slice(object):
     #---------------------------------------------------------------------------
 
     def CreateSurfaceFromIndex(self, pubsub_evt):
-        print pubsub_evt.data
         surface_parameters = pubsub_evt.data
 
         proj = Project()
@@ -1112,7 +1108,6 @@ class Slice(object):
         else:
             thresh_min, thresh_max = self.current_mask.threshold_range
 
-        print ">>>> THreshold", thresh_min, thresh_max
         m = (((slice_matrix >= thresh_min) & (slice_matrix <= thresh_max)) * 255)
         m[mask == 1] = 1
         m[mask == 2] = 2
@@ -1380,8 +1375,6 @@ class Slice(object):
         for buffer_ in self.buffer_slices.values():
             buffer_.discard_buffer()
 
-        print type(self.matrix)
-
     def OnExportMask(self, pubsub_evt):
         pass
         ##imagedata = self.current_mask.imagedata
diff --git a/invesalius/data/styles.py b/invesalius/data/styles.py
index 3200f67..4c7c13a 100644
--- a/invesalius/data/styles.py
+++ b/invesalius/data/styles.py
@@ -1381,9 +1381,6 @@ class WaterShedInteractorStyle(DefaultInteractorStyle):
                     ##tmp_image = ndimage.morphological_gradient((image - image.min()).astype('uint16'), self.config.mg_size)
                     #tmp_mask = watershed_ift(tmp_image, markers.astype('int8'), bstruct)
 
-            print "mask.max >>>", tmp_mask.max()
-            print "mask.min >>>", tmp_mask.min()
-
             if self.viewer.overwrite_mask:
                 mask[:] = 0
                 mask[tmp_mask == 1] = 253
diff --git a/invesalius/data/viewer_slice.py b/invesalius/data/viewer_slice.py
index a2ade53..2952694 100755
--- a/invesalius/data/viewer_slice.py
+++ b/invesalius/data/viewer_slice.py
@@ -1228,7 +1228,6 @@ class Viewer(wx.Panel):
         "Inserting actors"
         actors, n = pubsub_evt.data
         pos = self.scroll.GetThumbPosition()
-        print actors
         #try:
             #renderer = self.renderers_by_slice_number[n]
             #for actor in actors:
diff --git a/invesalius/gui/data_notebook.py b/invesalius/gui/data_notebook.py
index 31f9de3..63a7df5 100644
--- a/invesalius/gui/data_notebook.py
+++ b/invesalius/gui/data_notebook.py
@@ -433,7 +433,6 @@ class MasksListCtrlPanel(wx.ListCtrl, listmix.TextEditMixin):
                 self.SetItemImage(key, 0)
 
     def __hide_current_mask(self, pubsub_evt):
-        print self.mask_list_index.keys()
         self.SetItemImage(self.current_index, 0)
 
     def __init_columns(self):
diff --git a/invesalius/gui/default_viewers.py b/invesalius/gui/default_viewers.py
index c31f801..948cb75 100644
--- a/invesalius/gui/default_viewers.py
+++ b/invesalius/gui/default_viewers.py
@@ -457,7 +457,6 @@ class VolumeToolPanel(wx.Panel):
         self.id_cutplane = None
         submenu = wx.Menu()
         for name in const.RAYCASTING_TOOLS:
-           print name
            id = wx.NewId()
            if not(self.id_cutplane):
                self.id_cutplane = id
diff --git a/invesalius/gui/dialogs.py b/invesalius/gui/dialogs.py
index a1e40a9..8142501 100644
--- a/invesalius/gui/dialogs.py
+++ b/invesalius/gui/dialogs.py
@@ -1489,7 +1489,10 @@ class WatershedOptionsDialog(wx.Dialog):
 
 class MaskBooleanDialog(wx.Dialog):
     def __init__(self, masks):
-        wx.Dialog.__init__(self, wx.GetApp().GetTopWindow(), -1, _(u"Boolean operations"))
+        pre = wx.PreDialog()
+        pre.Create(wx.GetApp().GetTopWindow(), -1, _(u"Boolean operations"),  style=wx.DEFAULT_DIALOG_STYLE|wx.FRAME_FLOAT_ON_PARENT|wx.STAY_ON_TOP)
+        self.PostCreate(pre)
+
         self._init_gui(masks)
         self.CenterOnScreen()
 
diff --git a/invesalius/gui/frame.py b/invesalius/gui/frame.py
index 6538c28..895beb0 100644
--- a/invesalius/gui/frame.py
+++ b/invesalius/gui/frame.py
@@ -475,7 +475,6 @@ class Frame(wx.Frame):
         Publisher.sendMessage('Show import directory dialog')
 
     def ShowRetrieveDicomPanel(self):
-        print "teste.............."
         Publisher.sendMessage('Show retrieve dicom panel')
 
     def ShowOpenProject(self):
@@ -506,15 +505,12 @@ class Frame(wx.Frame):
         Publisher.sendMessage('Reload actual slice')
 
     def OnUndo(self):
-        print "Undo"
         Publisher.sendMessage('Undo edition')
 
     def OnRedo(self):
-        print "Redo"
         Publisher.sendMessage('Redo edition')
 
     def OnMaskBoolean(self):
-        print "Mask boolean"
         Publisher.sendMessage('Show boolean dialog')
 
     def OnCleanMask(self):
@@ -1376,7 +1372,6 @@ class SliceToolBar(AuiToolBar):
         for item in self.enable_items:
             state = self.GetToolToggled(item)
             if state and (item != id):
-                print ">>>>", item
                 self.ToggleTool(item, False)
         #self.ToggleTool(const.SLICE_STATE_SCROLL, self.GetToolToggled(const.SLICE_STATE_CROSS))
         #self.Update()
@@ -1691,11 +1686,9 @@ class HistoryToolBar(AuiToolBar):
         self.SetToolNormalBitmap(ID_LAYOUT,self.BMP_WITH_MENU)
 
     def OnUndo(self, event):
-        print "Undo"
         Publisher.sendMessage('Undo edition')
 
     def OnRedo(self, event):
-        print "Redo"
         Publisher.sendMessage('Redo edition')
 
     def OnToggle(self, event):
diff --git a/invesalius/gui/task_exporter.py b/invesalius/gui/task_exporter.py
index afd143d..ec3f5c5 100644
--- a/invesalius/gui/task_exporter.py
+++ b/invesalius/gui/task_exporter.py
@@ -257,7 +257,6 @@ class InnerTaskPanel(wx.Panel):
         menu.Bind(wx.EVT_MENU, self.OnMenuPicture)
 
     def OnMenuPicture(self, evt):
-        print "OnMenuPicture"
         id = evt.GetId()
         value = dlg.ExportPicture(self.id_to_name[id])
         if value:
@@ -273,7 +272,6 @@ class InnerTaskPanel(wx.Panel):
 
     def OnLinkExportMask(self, evt=None):
         project = proj.Project()
-        print "OnLinkEportMask"
         if sys.platform == 'win32':
             project_name = project.name
         else:
@@ -290,7 +288,6 @@ class InnerTaskPanel(wx.Panel):
 
         if dlg.ShowModal() == wx.ID_OK:
             filename = dlg.GetPath()
-            print "filename", filename
             extension = "vti"
             if sys.platform != 'win32':
                 if filename.split(".")[-1] != extension:
diff --git a/invesalius/gui/task_slice.py b/invesalius/gui/task_slice.py
index 780dc5c..41d3ebf 100644
--- a/invesalius/gui/task_slice.py
+++ b/invesalius/gui/task_slice.py
@@ -305,7 +305,6 @@ class InnerFoldPanel(wx.Panel):
         self.__bind_pubsub_evt()
 
     def __calc_best_size(self, panel):
-        print "Best size", self.GetSize()
         parent = panel.GetParent()
         q = panel.Reparent(self)
 
@@ -335,8 +334,6 @@ class InnerFoldPanel(wx.Panel):
         #if self.last_size is None or self.last_size.GetHeight() < size.GetHeight():
             #self.SetInitialSize(size)
 
-        print "Best size", size, self.GetSize(), self.GetClientSize(), q
-
     def __bind_evt(self):
         self.fold_panel.Bind(fpb.EVT_CAPTIONBAR, self.OnFoldPressCaption)
 
@@ -494,7 +491,6 @@ class MaskProperties(wx.Panel):
             self.combo_thresh.Delete(i)
 
     def OnRemoveMasks(self, pubsub_evt):
-        print "OnRemoveMasks"
         list_index = pubsub_evt.data
         for i in list_index:
             self.combo_mask_name.Delete(i)
diff --git a/invesalius/gui/task_surface.py b/invesalius/gui/task_surface.py
index 64a87d7..a830436 100644
--- a/invesalius/gui/task_surface.py
+++ b/invesalius/gui/task_surface.py
@@ -512,7 +512,6 @@ class SurfaceProperties(wx.Panel):
         name = pubsub_evt.data[1]
         colour = [value*255 for value in pubsub_evt.data[2]]
         i = 0
-        print name, index, self.surface_list
         try:
             i = self.surface_list.index([name, index])
             overwrite = True
diff --git a/invesalius/gui/widgets/gradient.py b/invesalius/gui/widgets/gradient.py
index 5b581c9..e93dd95 100755
--- a/invesalius/gui/widgets/gradient.py
+++ b/invesalius/gui/widgets/gradient.py
@@ -475,7 +475,6 @@ class GradientCtrl(wx.Panel):
     def ChangeMinValue(self, e):
         # Why do I need to change slide min value if it has been changed for
         # the user?
-        print "ChangeMinValue", self.slided
         if not self.slided:
             self.gradient_slider.SetMinValue(int(self.spin_min.GetValue()))
             self._GenerateEvent(myEVT_THRESHOLD_CHANGE)
@@ -496,10 +495,8 @@ class GradientCtrl(wx.Panel):
     def _GenerateEvent(self, event):
         if event == myEVT_THRESHOLD_CHANGING:
             self.changed = True
-            print 'changing'
         elif event == myEVT_THRESHOLD_CHANGED :
             self.changed = False
-            print 'changed'
 
         evt = SliderEvent(event, self.GetId(), self.min_range,
                           self.max_range, self.minimun, self.maximun)
diff --git a/invesalius/gui/widgets/slice_menu.py b/invesalius/gui/widgets/slice_menu.py
index 0b8656c..8dccc38 100644
--- a/invesalius/gui/widgets/slice_menu.py
+++ b/invesalius/gui/widgets/slice_menu.py
@@ -258,7 +258,6 @@ class SliceMenu(wx.Menu):
             Publisher.sendMessage('Update slice viewer')
 
         elif key in PROJECTIONS_ID:
-            print 'Key', key
             pid = PROJECTIONS_ID[key]
             Publisher.sendMessage('Set projection type', pid)
             Publisher.sendMessage('Reload actual slice')
--
libgit2 0.21.2