Expandable Objects - Managed C++ - c++-cli

Question

I try to develop custom control in managed c++, My custom cuntrol inherits from the Control class, As part of it i want to add custom properties to my custom control, to do that i created a class called ControlStyle, this class contains some properties like: colors, font etc.
Now i want to make a property of type ControlStyle in the CustomControl class, I'll explain myself: I want a property of type ControlStyle that will shown with the "+" sign in the properties window (called expandable properties), in the class CustomControl. so i did it, the problem is: that i drag and drop the custom control to a form and modify the values of the ControlStyle properties, and when i execute the application i see that any value of the ControlStyle properties that were changed by the user at the design time - not saved, and waht i get at runtime is the initial value of the ControlStyle properties, I understand that i'm not so clear, so lets talk code:
My ControlStyle class:
[TypeConverter(typeid(ExpandableObjectConverter))]
public ref class ControlStyle
{
// private variables
private: System::Drawing::Font^ font;
private: Color backColor1 = Color::Blue;
private: Color backColor2 = Color::Red;
// constructor
public: ControlStyle::ControlStyle()
{
font = gcnew System::Drawing::Font("Arial", 12);
}
// properties
public: property Color BackColor1
{
Color get() { retun backColor1; }
void set(Color value) { backColor1 = value; }
}
public: property Color BackColor2
{
Color get() { retun backColor2; }
void set(Color value) { backColor2 = value; }
}
public: virtual property System::Drawing::Font^ Font
{
virtual System::Drawing::Font^ get() override { return font; }
virtual void set(System::Drawing::Font^ value) override
{ font = value; }
}
}
My CustomControl class:
public ref class CustomControl : public System::Windows::Forms::Control
{
// private variables
private: ControlStyle^ controlStyle;
// constructor
public: CustomControl::CustomControl()
{
controlStyle = gcnew ControlStyle();
}
// properties
public: property ControlStyle^ Style
{
ControlStyle^ get() { return controlStyle; }
}
// methods like paint etc.
}
When i use the custom control on a form, (i see the first values of the ControlStyle properties like the initialization of them in the ControlStyle class), and i modify the values of the ControlStyle properties (Note: i modify the values of ControlStyle properties not by code, but manually by the properties window and i see the changes on the control - it works well), for example:
customControl1->Style->BackColor1 = Color::Green;
When i execute the program i see (at runtime) that the value of the customControl1->Style->BackColor1 property is Color::Blue that is the value of it's initial definition, and not Color::Green - which is the value that i put at design time.
To solve the issue i wrote the values that the customControl1->Style->BackColor1 property gets by the user at design time to a file and read it back when the DesignMode property change it's value to false, and additional attempts like this - and nothing...
I saw blogs says that it problem of serialization.
also applying the SerializableAttribute to the classes - does not work.
I think the reason for this problem is the initialization of the controlStyle variable in the CustomControl's constructor, i.e:
controlStyle = gcnew ControlStyle();
But this initialization must to be done for the control's function.
I will be very grateful for any help. Thanks alot!!