virtual method call error

[Vasco Lohrenscheit]

Hello,

in the following situation the wrong virtual method gets called:

-----------------------------------------------------
//assembly1
#include "../Plugin/iPlugin.h" //ISO c++ type iPlugin
public __gc class PluginGUI : public System::Windows::Forms::Form
{
virtual iPlugin* plugin();
virtual void plugin(iPlugin* p);
};

//assembly2
public __gc class TestGUI : public GUI::PluginGUI
{
virtual iPlugin* plugin() {return testplugin;}
virtual void plugin(iPlugin* p) {testplugin=p;}
private:
iPlugin* m_testplugin;
};

/*
....
assembly = Assembly::LoadFrom...
Object* obj = assembly->CreateInstance(TestGUI);
....
*/

iPlugin* test_plugin;
PluginGUI* gui = dynamic_cast<PluginGUI*>(obj);
gui->plugin(test_plugin);
-----------------------------------------------------

I load the derived TestGUI from an asssembly and if I call the plugin
method, PluginGUI::plugin gets called and not TestGUI::plugin. Why that?

What can I do to get normal c++ behaviour, namely virtual methods from
derived classes get called?

best regards,

Vasco Lohrenscheit