Add empty paint() method to Checkbox & Button

radio/src/thirdparty/libopenui/src/button.h

@@ -116,6 +116,8 @@ class TextButton: public Button
      bgColorHandler = std::move(handler);
    }
 
+   void paint(BitmapBuffer* dc) override {}
+
   protected:
     lv_obj_t * label = nullptr;
 

radio/src/thirdparty/libopenui/src/checkbox.h

@@ -66,6 +66,8 @@ class CheckBox : public FormField {
       _setValue = std::move(handler);
     }
 
+    void paint(BitmapBuffer* dc) override {}
+  
   protected:
     std::string label;
     std::function<uint8_t()> _getValue;