I am creating a dialog, it’s inherited from CDialogEx (dialog class name DockColorDlg), and create another class (ColorDockable) that’s inheriting from the CDockablePane class. And in my ColorDockable class I am creating the instanced of the DockColorDlg (DockColorDlg m_wndDialog).

Now I am calling from my Mainfram.cpp and create the dockable window, when I am implementing this then it will work, but after few times or a few build it will not create the window.

calling from my Mainfrm.cpp:

    if (!m_wndMyDockablePane.Create(_T("Weaves & Color"), this, CRect(0, 0, 200, 200), TRUE,          ID_VIEW_MYDOCKABLEPANE, WS_CHILD | WS_VISIBLE | CBRS_TOP))
    {
        TRACE0("Failed to create dockable panen");
        return -1; // fail to create
    }   

    m_wndMyDockablePane.EnableDocking(CBRS_ALIGN_RIGHT | CBRS_ALIGN_LEFT);

    DockPane(&m_wndMyDockablePane);

    //this in my ColorDockable.cpp
    int ColorDockable::OnCreate(LPCREATESTRUCT lpCreateStruct)
    {
        TRACE("ColorDockable::OnCreate calledn");

        if (CDockablePane::OnCreate(lpCreateStruct) == -1)
            return -1;

        if(!m_wndDialog.Create(IDD_DOC_COLOR_DLG, this));
        {
            TRACE("Failed to create dialogn");
            return 0; // Fail to create
        }
        bool check = m_wndDialog.ShowWindow(SW_SHOWNORMAL);
        m_wndDialog.SetWindowPos(NULL, 0, 0, lpCreateStruct->cx, lpCreateStruct->cy, SWP_NOZORDER |    SWP_SHOWWINDOW);
        //ShowDockableDialog();
        return 0;
    }

//but its not created TRACE("Failed to create dialogn");