Callback invoked when loading a custom component from XML.
virtual CL_Callback_2<CL_GUIComponent*, CL_GUICompon*, *, CL_String>& CL_GUIComponent::func_create_custom_component();
Detailed description:
The type of the component to create is passed as a parameter to the function. The callback function should create the desired component and return it, or return 0, if no component is created. Example definition: CL_GUIComponent *Foo::on_create_custom_component(CL_GUIComponent *parent, CL_String type);