C++ adding window to MDI

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C++

This is my code

private: System::Void Form1_Load(System::Object^  sender, System::EventArgs^  e) {
    #include "thehtmleditor.h"

               // This gets a new instance of our child window.
thehtmleditor* newMDIChild = new thehtmleditor();
// Tells our new child window
// what is our parent window.
newMDIChild->MdiParent = this;
// Shows the new form.
// Don't confuse this with ShowDialog!
newMDIChild->Show();
         }

this should add the form thehtmleditor to the mdi from in the this form, but It doesn't work for some reason can some one please help?