ComboBox子类化问题

[cdpc0202]

HBRUSH CMyCombobox::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
	HBRUSH hbr = CComboBox::OnCtlColor(pDC, pWnd, nCtlColor);

	// TODO:  在此更改 DC 的任何属性

	// TODO:  如果默认的不是所需画笔，则返回另一个画笔
	if(nCtlColor == CTLCOLOR_STATIC && m_static.GetSafeHwnd() == NULL)
	{
		m_static.SubclassWindow(pWnd->GetSafeHwnd());
	}
	if(nCtlColor == CTLCOLOR_BTN)
	{
		int a = 5;
	}
	if(nCtlColor == CTLCOLOR_LISTBOX && m_list.GetSafeHwnd() == NULL)
	{
		m_list.SubclassWindow(pWnd->GetSafeHwnd());
		m_list.SendMessage(WM_NCPAINT,0,0);
	}
	return hbr;
}

问题1：
MSDN描述A combo box consists of a list box combined with either a static control or edit control
DropList风格时 为什么

if(nCtlColor == CTLCOLOR_STATIC && m_static.GetSafeHwnd() == NULL)
	{
		m_static.SubclassWindow(pWnd->GetSafeHwnd());//调用不到？
	}

combobox的drop-down arrow 是个按钮吗？可以子类化这个按钮吗？（CTLCOLOR_BTN 同样调用不到）

问题2：
子类化listbox后 static control or edit control不能显示当前选择的Item的文本。
这些问题如何解决？

[uipower11]

路过~~~~~~~~~

[jin_yan]

ComboBox has no WM_CTLCOLORxxx message!!!
ListBox has WM_CTLCOLORLISTBOX
Edit has WM_CTLCOLOREIDT and WM_CTLCOLORSTATIC
you should subclass combobox and hook Listbox & Edit's WM_CTLCOLORxxx

[jin_yan]

arrow is NOT a button. It is painted by Combobox's WM_PAINT handler

[lklwlklw]

2楼的那个仁兄讲的很清楚了，路过

[panpengpeng]

上面有高手，已经说的很清楚了，帮顶

[WilsonChinaBug]

2楼的那个仁兄讲的很清楚哈