.NET (Core and Framework)

Hello all. Much Googling has yielded no satisfactory answer to this, and I'm hoping someone here knows how I might solve my problem.

I'm trying to embed Windows Media Player 9 in my Windows Forms application using MC++. If I drop it on the form and run, it's happy. But as soon as I try to set any WMP-specific properties, I get the error

An unhandled exception of type 'InvalidActiveXStateException' occurred in axinterop.wmplib.dll

Here's my InitializeComponent() function:

void InitializeComponent(void)
{
            System::Resources::ResourceManager *  resources = new System::Resources::ResourceManager(__typeof(TMVideo::TMVideoControl));
            this->axWindowsMediaPlayer1 = new AxInterop::WMPLib::AxWindowsMediaPlayer();
            (__try_cast<System::ComponentModel::ISupportInitialize *  >(this->axWindowsMediaPlayer1))->BeginInit();
            this->SuspendLayout();
            // 
            // axWindowsMediaPlayer1
            // 
            this->axWindowsMediaPlayer1->Enabled = true;
            this->axWindowsMediaPlayer1->Location = System::Drawing::Point(48, 40);
            this->axWindowsMediaPlayer1->Name = S"axWindowsMediaPlayer1";
            this->axWindowsMediaPlayer1->OcxState = (__try_cast<System::Windows::Forms::AxHost::State *  >(resources->GetObject(S"axWindowsMediaPlayer1.OcxState")));
            this->axWindowsMediaPlayer1->Size = System::Drawing::Size(232, 216);
            this->axWindowsMediaPlayer1->TabIndex = 0;
            this->axWindowsMediaPlayer1->enableContextMenu = false;
>>>         this->axWindowsMediaPlayer1->uiMode = S"none";

            // 
            // TMVideoControl
            // 
            this->Controls->Add(this->axWindowsMediaPlayer1);
            this->Name = S"TMVideoControl";
            this->Size = System::Drawing::Size(368, 336);
            (__try_cast<System::ComponentModel::ISupportInitialize *  >(this->axWindowsMediaPlayer1))->EndInit();
            this->ResumeLayout(false);
}

I added the two lines where enableContextMenu and uiMode are being set. Without those, the control loads and displays without a crash - but it's not the behavior I want from it.

Does anyone know what I'm doing wrong?

Thanks,
Mike