ENH:transparent colored filaments are supported in the color picker

Change-Id: I1800d66ba4002ccef5c7edbd3c72d4410d1cd7a3

src/slic3r/GUI/AMSMaterialsSetting.hpp

@@ -58,6 +58,8 @@ public:
 class ColorPickerPopup : public PopupWindow
 {
 public:
+    ScalableBitmap m_ts_bitmap_custom;
+    wxStaticBitmap* m_ts_stbitmap_custom;
     StaticBox* m_custom_cp;
     wxColourData* m_clrData;
     StaticBox* m_def_color_box;