Begins the evaluation of the expression.
HRESULT Start( IDebugExpressionCallBack* pdecb );
[in] Callback for indicating when the expression evaluation is complete. If this parameter is NULL, no events are fired and the client must poll the expression state by using QueryIsComplete.
The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.
The method succeeded.
This method begins the evaluation of the expression.