Visual C++ 2005: How do I access Win32 form control values in a .cpp file?

Junk::Form1::trackBar1->value
Junk::Form1::trackBar1.value
Junk::Form1->trackBar1
Junk->Form1->trackBar1
this->trackBar1->value //This is legal in the .h file, and how I can get it to work there
trackBar1->value

this->trackBar1 = (gcnew System::Windows::Forms::TrackBar());

class
{
...
};

#include "foo.h"

... definitions ...