How can I remove dots from left side of menu bar in MFC SDI App?

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C++

MFC

I have an MFC SDI App. I have removed the tool bar by commenting out the code below in MainFrm.cpp:

//if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP | CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||
	//	!m_wndToolBar.LoadToolBar(theApp.m_bHiColorIcons ? IDR_MAINFRAME_256 : IDR_MAINFRAME))
	//{
	//	TRACE0("Failed to create toolbar\n");
	//	return -1;      // fail to create
	//}
	//CString strToolBarName;
	//bNameValid = strToolBarName.LoadString(IDS_TOOLBAR_STANDARD);
	//ASSERT(bNameValid);
	//m_wndToolBar.SetWindowText(strToolBarName);
	//CString strCustomize;
	//bNameValid = strCustomize.LoadString(IDS_TOOLBAR_CUSTOMIZE);
	//ASSERT(bNameValid);
	//m_wndToolBar.EnableCustomizeButton(TRUE, ID_VIEW_CUSTOMIZE, strCustomize);
	//// Allow user-defined toolbars operations:
	//InitUserToolbars(NULL, uiFirstUserToolBarId, uiLastUserToolBarId);

I now just have a menu bar across the top of the main frame, which is what I want. However, there are these really annoying small set of vertical dots to the left of the menu bar. The dots are a slightly darker shade than the background. Can anyone tell me what these are and how to get rid of them. I have since noticed that some applications have these and others don't. I don't know why this is, they don't seem to have any use.