CDateTimeCtrl的疑问

遇到一个需求，修改MFC中datetimepicker的背景颜色，看到网上的一些建议，重写OnEraseBkgnd
部分代码如下：

//h
class CCDateTimeCtrlDlg : public CDialogEx
{
// 构造
...
	DECLARE_MESSAGE_MAP()
public:
	class _CDateTimeCtrl;	//内部 CDateTimeCtrl 类
	_CDateTimeCtrl*		m_pInnerDateTimeCtrl;
...
};

//cpp
class CCDateTimeCtrlDlg::_CDateTimeCtrl : public CDateTimeCtrl
{
public:
	_CDateTimeCtrl(CCDateTimeCtrlDlg* pSiteUIComponent)
		: m_pSiteUIComponent(pSiteUIComponent)
		, m_dwTickCount(0)
	{
	}

	~_CDateTimeCtrl()
	{

	};

public:
	DECLARE_MESSAGE_MAP()
public:
	afx_msg BOOL OnEraseBkgnd(CDC* pDC);
	afx_msg HBRUSH OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor);
	afx_msg HBRUSH CtlColor(CDC* pDC, UINT nCtlColor);
private:
	CCDateTimeCtrlDlg* m_pSiteUIComponent;
	DWORD m_dwTickCount;
	CBrush    m_cBrush;
};
BEGIN_MESSAGE_MAP(CCDateTimeCtrlDlg::_CDateTimeCtrl, CDateTimeCtrl)
	ON_WM_CTLCOLOR_REFLECT()
	ON_WM_ERASEBKGND()
	ON_WM_CTLCOLOR()
END_MESSAGE_MAP()

BOOL CCDa
teTimeCtrlDlg::_CDateTimeCtrl::OnEraseBkgnd(CDC* pDC)
{

	//HBRUSH hBrushBkgnd = (HBRUSH) ::SendMessage(GetParent()->GetSafeHwnd(),
	//	WM_CTLCOLOREDIT, WPARAM(pDC->GetSafeHdc()), LPARAM(m_hWnd));
	//CRect rectClient;
	//GetClientRect(rectClient);
	//pDC->FillRect(rectClient, CBrush::FromHandle(hBrushBkgnd));
	//return TRUE;

	CBrush bBrush(RGB(10, 200, 255));
	//m_cBrush.CreateSolidBrush(RGB(0, 0, 255));
	CBrush* pOldBrush2 = pDC->SelectObject(&bBrush);

	CRect rect;
	pDC->GetClipBox(&rect);
	pDC->PatBlt(rect.left, rect.top, rect.Width(), rect.Height(), PATCOPY);
	pDC->FillRect(rect, &bBrush);
	pDC->SetBkMode(TRANSPARENT);
	pDC->SetBkColor(RGB(143, 159, 140));
	//pDC->SelectObject(pOldBrush2);

	return TRUE;
}
HBRUSH CCDateTimeCtrlDlg::_CDateTimeCtrl::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
	HBRUSH hbr = CDateTimeCtrl::OnCtlColor(pDC, pWnd, nCtlColor);

	hbr = ::CreateSolidBrush(RGB(14, 159, 140));
	pDC->SetBkMode(TRANSPARENT);
	pDC->SetBkColor(RGB(14, 159, 140));
	pDC->SetTextColor(RGB(25, 255, 255));
	pDC->SetBkColor(RGB(143, 159, 140));

	return hbr;
}
HBRUSH CCDateTimeCtrlDlg::_CDateTimeCtrl::CtlColor(CDC* pDC, UINT nCtlColor)
{
	COLORREF clTextColor = m_pSiteUIComponent->m_clTextColor;
	pDC->SetTextColor(clTextColor);
	//HBRUSH newHbr = CreateSolidBrush( clTextColor );
	//return newHbr;
	//m_cBrush.DeleteObject();
	//m_cBrush.CreateSolidBrush(clTextColor);
	m_cBrush.CreateSolidBrush(RGB(255, 0, 255));
	CRect rect;
	pDC->SelectObject(&m_cBrush);
	pDC->GetClipBox(&rect);
	pDC->PatBlt(rect.left, rect.top, rect.Width(), rect.Height(), PATCOPY);
	pDC->FillRect(rect, &m_cBrush);
	pDC->SetBkColor(RGB(143, 159, 140));
//	::SetBkColor(pDC, RGB(255, 0, 255));
	return (HBRUSH)(m_cBrush.GetSafeHandle());
}

....
void CCDateTimeCtrlDlg::OnBnClickedButton1()
{
	if (m_pInnerDateTimeCtrl->GetSafeHwnd() != NULL)
	{
		{
			m_pInnerDateTimeCtrl->SetFocus();
			keybd_event(VK_MENU, MapVirtualKey(VK_MENU, 0), 0, 0);
			keybd_event(VK_DOWN, MapVirtualKey(VK_DOWN, 0), 0, 0);
			keybd_event(VK_DOWN, MapVirtualKey(VK_DOWN, 0), KEYEVENTF_KEYUP, 0);
			keybd_event(VK_MENU, MapVirtualKey(VK_MENU, 0), KEYEVENTF_KEYUP, 0);
		}
		{
			//SendMessage(m_pInnerDateTimeCtrl->GetSafeHwnd(), WM_LBUTTONDOWN, MK_LBUTTON, m_pInnerDateTimeCtrl->Width - 5);
		}
	}
	// TODO: 在此添加控件通知处理程序代码
	DWORD dwStyle(DTS_SHORTDATEFORMAT);
		// DTS_SHORTDATEFORMAT;
		//DTS_LONGDATEFORMAT;
		//DTS_TIMEFORMAT | DTS_UPDOWN;	// 对于时间方式，要显示带有上下调整时间的小按钮。默认方式是日历方式
		//DTS_TIMEFORMAT | DTS_UPDOWN;	// 对于自定义时间方式，要显示带有上下调整时间的小按钮。默认方式是日历方式
	CRect rcBounds(100, 150, 400, 200);
	m_pInnerDateTimeCtrl = new _CDateTimeCtrl(this);
	BOOL bResult = m_pInnerDateTimeCtrl->Create(
		WS_CHILD | WS_VISIBLE | WS_TABSTOP | dwStyle,
		rcBounds,
		this,
		0
	);
	if (!bResult)
	{
		MessageBox(_T("error"));
	}
	return;
}

胡乱试验了一通，还是没有实现，不知道应该怎么弄。
参考：
https://blog.csdn.net/u010679316/article/details/80127501
https://blog.csdn.net/liumenghappy/article/details/6475628
https://bbs.csdn.net/topics/30433378?list=160112
https://blog.csdn.net/xuheazx/article/details/16856525
https://bbs.csdn.net/topics/40237067

不是很通用的方法，屏蔽以下语句：

#pragma comment(linker,"/manifestdependency:/"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='x86' publicKeyToken='6595b64144ccf1df' language='*'/"")

还有个想象可行的方法就是

#include "uxtheme.h"
#pragma comment(lib, "uxtheme.lib") 


//调用创建后调用SetWindowTheme
BOOL bResult = m_pInnerDateTimeCtrl->Create(
		WS_CHILD | WS_VISIBLE | WS_TABSTOP | WS_CLIPSIBLINGS | dwStyle,
		rcBounds,
		this,
		101
	);
HRESULT result = ::SetWindowTheme(m_pInnerDateTimeCtrl->m_hWnd, L"", L"");

但是实际没有生效，不知道什么原因

如果想要下拉月历窗口背景等颜色可修改，可以试试

SetThemeAppProperties(0/*dwFlags*/);