How do I assign text to a textbox in C++

Question

I have a silverlight app that uses TextBox XAML controls.

In the c++ code-behind, IXRTextBoxPtr types are associated with these textboxes using "FindName" like this:

FindName(L"ColNum3", &m_pColNum3);

(where ColNum3 corresponds with the XAML CODE like this: )

Then, the code assigns the pointer like this:

std::wstring wsTransfer;  // gets the wstring from imput

const WCHAR * wpszInput;

wpszInput = wsTransfer.c_str();

m_pColNum3->SetText(wpszInput);

but the display does not show the text data.

What am I missing? What steps am I missing to have this text modification display on the screen?

If I did not ask this question completely or left something off, please let me know.