Problem with Dialog

Hi all,
I got a SDI application, in the InitInstance i launch a dialog defined as below:

Code:

IDD_RACES_DIALOG DIALOG DISCARDABLE  0, 0, 327, 124
STYLE WS_POPUP
FONT 8, "MS Sans Serif"
BEGIN
    DEFPUSHBUTTON   "",IDOK,3,5,11,11
    PUSHBUTTON      "",IDC_BTN_PLAY,46,80,34,19
    CONTROL         "Slider1",IDC_SLIDER,"msctls_trackbar32",TBS_BOTH |

                    TBS_NOTICKS | WS_TABSTOP,217,86,110,13
END

I want to add a command on MainFrame to bring the dialog on the foreground and I tryed a lot of ways (for example SetWindowPos, SetFocus, PostMessage(WM_LBUTTONDOWN), ...) but the app alwais raises a runtime assertion: ASSERT:IsWindow(m_hWnd)).
Is there a way to solve this problem?
Thanks
Paolo

 

U may go to InitInstance() method of APP class and insert the code as following steps.
Create an instance for tat dialog.
dialog_instance.DoModal();

I think this will work.