diff --git a/include/wx/clrpicker.h b/include/wx/clrpicker.h
index 5e30999e06..840e0b1123 100644
--- a/include/wx/clrpicker.h
+++ b/include/wx/clrpicker.h
@@ -68,6 +68,7 @@ protected:
 // NOTE: this style is supported just by wxColourButtonGeneric and
 //       thus is not exposed in wxColourPickerCtrl
 #define wxCLRP_SHOW_LABEL             0x0008
+#define wxCLRP_SHOW_ALPHA             0x0010
 
 // map platform-dependent controls which implement the wxColourPickerWidgetBase
 // under the name "wxColourPickerWidget".
@@ -146,7 +147,7 @@ public:        // internal functions
 
 protected:
     virtual long GetPickerStyle(long style) const wxOVERRIDE
-        { return (style & wxCLRP_SHOW_LABEL); }
+        { return (style & (wxCLRP_SHOW_LABEL | wxCLRP_SHOW_ALPHA)); }
 
 private:
     wxDECLARE_DYNAMIC_CLASS(wxColourPickerCtrl);
diff --git a/samples/dialogs/dialogs.cpp b/samples/dialogs/dialogs.cpp
index dfa711bf41..0091c817c1 100644
--- a/samples/dialogs/dialogs.cpp
+++ b/samples/dialogs/dialogs.cpp
@@ -140,6 +140,7 @@ wxBEGIN_EVENT_TABLE(MyFrame, wxFrame)
 #endif // wxUSE_RICHMSGDLG
 #if wxUSE_COLOURDLG
     EVT_MENU(DIALOGS_CHOOSE_COLOUR,                 MyFrame::ChooseColour)
+    EVT_MENU(DIALOGS_CHOOSE_COLOUR_ALPHA,           MyFrame::ChooseColour)
     EVT_MENU(DIALOGS_GET_COLOUR,                    MyFrame::GetColour)
 #endif // wxUSE_COLOURDLG
 
@@ -375,7 +376,10 @@ bool MyApp::OnInit()
     wxMenu *choices_menu = new wxMenu;
 
     #if wxUSE_COLOURDLG
-        choices_menu->Append(DIALOGS_CHOOSE_COLOUR, wxT("&Choose bg colour"));
+        wxMenu *choices_bg_colour = new wxMenu;
+        choices_bg_colour->Append(DIALOGS_CHOOSE_COLOUR, wxT("&No opacity"));
+        choices_bg_colour->Append(DIALOGS_CHOOSE_COLOUR_ALPHA, wxT("&With opacity"));
+        choices_menu->Append(wxID_ANY, wxT("&Choose bg colour"), choices_bg_colour);
         choices_menu->Append(DIALOGS_GET_COLOUR, wxT("&Choose fg colour"));
     #endif // wxUSE_COLOURDLG
 
@@ -710,9 +714,10 @@ MyFrame::~MyFrame()
 
 #if wxUSE_COLOURDLG
 
-void MyFrame::ChooseColour(wxCommandEvent& WXUNUSED(event))
+void MyFrame::ChooseColour(wxCommandEvent& event)
 {
     m_clrData.SetColour(m_canvas->GetBackgroundColour());
+    m_clrData.SetChooseAlpha(event.GetId() == DIALOGS_CHOOSE_COLOUR_ALPHA);
 
     wxColourDialog dialog(this, &m_clrData);
     dialog.SetTitle(_("Please choose the background colour"));
diff --git a/samples/dialogs/dialogs.h b/samples/dialogs/dialogs.h
index 3d8647399b..f3428bf56c 100644
--- a/samples/dialogs/dialogs.h
+++ b/samples/dialogs/dialogs.h
@@ -65,8 +65,7 @@ of MSW, MAC and OS2
 #define USE_DIRDLG_GENERIC \
     ((USE_WXMSW || USE_WXMAC) && USE_GENERIC_DIALOGS && wxUSE_DIRDLG)
 #define USE_FILEDLG_GENERIC \
-    ((((USE_WXMSW || USE_WXMAC || USE_WXGTK) \
-                    && USE_GENERIC_DIALOGS) ) && wxUSE_FILEDLG)
+    ((USE_WXMSW || USE_WXMAC) && USE_GENERIC_DIALOGS  && wxUSE_FILEDLG)
 #define USE_FONTDLG_GENERIC \
     ((USE_WXMSW || USE_WXMACFONTDLG) && USE_GENERIC_DIALOGS && wxUSE_FONTDLG)
 
@@ -534,6 +533,7 @@ private:
 enum
 {
     DIALOGS_CHOOSE_COLOUR = wxID_HIGHEST,
+    DIALOGS_CHOOSE_COLOUR_ALPHA,
     DIALOGS_GET_COLOUR,
     DIALOGS_CHOOSE_COLOUR_GENERIC,
     DIALOGS_CHOOSE_COLOUR_GENERIC_ALPHA,
diff --git a/samples/widgets/clrpicker.cpp b/samples/widgets/clrpicker.cpp
index bcdfeec931..9a12d39a5f 100644
--- a/samples/widgets/clrpicker.cpp
+++ b/samples/widgets/clrpicker.cpp
@@ -98,7 +98,8 @@ protected:
     // --------------
 
     wxCheckBox *m_chkColourTextCtrl,
-               *m_chkColourShowLabel;
+               *m_chkColourShowLabel,
+               *m_chkColourShowAlpha;
     wxBoxSizer *m_sizer;
 
 private:
@@ -145,6 +146,7 @@ void ColourPickerWidgetsPage::CreateContent()
     wxStaticBoxSizer *clrbox = new wxStaticBoxSizer(wxVERTICAL, this, wxT("&ColourPicker style"));
     m_chkColourTextCtrl = CreateCheckBoxAndAddToSizer(clrbox, wxT("With textctrl"));
     m_chkColourShowLabel = CreateCheckBoxAndAddToSizer(clrbox, wxT("With label"));
+    m_chkColourShowAlpha = CreateCheckBoxAndAddToSizer(clrbox, wxT("With opacity"));
     boxleft->Add(clrbox, 0, wxALL|wxGROW, 5);
 
     boxleft->Add(new wxButton(this, PickerPage_Reset, wxT("&Reset")),
@@ -189,6 +191,9 @@ long ColourPickerWidgetsPage::GetPickerStyle()
     if ( m_chkColourShowLabel->GetValue() )
         style |= wxCLRP_SHOW_LABEL;
 
+    if ( m_chkColourShowAlpha->GetValue() )
+        style |= wxCLRP_SHOW_ALPHA;
+
     return style;
 }
 
@@ -227,7 +232,8 @@ void ColourPickerWidgetsPage::OnColourChange(wxColourPickerEvent& event)
 void ColourPickerWidgetsPage::OnCheckBox(wxCommandEvent &event)
 {
     if (event.GetEventObject() == m_chkColourTextCtrl ||
-        event.GetEventObject() == m_chkColourShowLabel)
+        event.GetEventObject() == m_chkColourShowLabel ||
+        event.GetEventObject() == m_chkColourShowAlpha)
         RecreatePicker();
 }
 
diff --git a/src/gtk/clrpicker.cpp b/src/gtk/clrpicker.cpp
index a51491d552..14cff5db3e 100644
--- a/src/gtk/clrpicker.cpp
+++ b/src/gtk/clrpicker.cpp
@@ -78,6 +78,9 @@ bool wxColourButton::Create( wxWindow *parent, wxWindowID id,
 #endif
     g_object_ref(m_widget);
 
+    // Display opacity slider
+    g_object_set(G_OBJECT(m_widget), "use-alpha",
+                 static_cast<bool>(style & wxCLRP_SHOW_ALPHA), NULL);
     // GtkColourButton signals
     g_signal_connect(m_widget, "color-set",
                     G_CALLBACK(gtk_clrbutton_setcolor_callback), this);
diff --git a/src/gtk/colordlg.cpp b/src/gtk/colordlg.cpp
index 9a1603649e..8397fa2c87 100644
--- a/src/gtk/colordlg.cpp
+++ b/src/gtk/colordlg.cpp
@@ -65,6 +65,7 @@ bool wxColourDialog::Create(wxWindow *parent, wxColourData *data)
         gtk_color_selection_dialog_get_color_selection(
         GTK_COLOR_SELECTION_DIALOG(m_widget)));
     gtk_color_selection_set_has_palette(sel, true);
+    gtk_color_selection_set_has_opacity_control(sel, m_data.GetChooseAlpha());
 
     return true;
 }