The dialog is a window which contains controls. The Dialog boxes are the form of input and output. The control can be placed on the dialog box for communicating. If you inherit the CView only at the run time you can visualize the output. While, using the CFormView or dialog based application you can envision the output at the design time itself. To maximize the dialog during the execution set the following:
ShowWindow(SW_SHOWMAXIMIZED); in OnInitDialog()
In the properties of the dialog set the maximize and Minimize button. Or else only X will be present in the upper right corner of the dialog for closing the dialog. For a dialog based application if you use CTRL+T at the design time you will see the dialog as it would be at the run time. Try this alternative after placing the controls.
For the dialog based application if you invoke CTRL+D the tab order of the controls will be displayed at the design time.