主对话框上附有几个子对话框，主对话框上有Button按钮，子对话框上有编辑框，要通过Button按钮操作编辑框的显示，

说是要自定义消息，我定义了可是没反应，谁能帮我看看呀
#define MSG_SEARCHINFO (WM_USER + 2004)
//DlgMain.h
#include "PageGroup.h"
public:
CPageGroup pagegroup;
//DlgMain.CPP
void CDlgMain::OnBnClickedBtnSearch()
{
pagegroup.SendMessage(MSG_SEARCHINFO,0,0);
}
//PageGroup.h
#include "DlgMain.h"
public:
CEdit m_ctrlName;
afx_msg LRESULT OnShowMemberInfo(WPARAM wParam, LPARAM lParam);
//PageGroup.CPP
BEGIN_MESSAGE_MAP(CPageGroup, CDialog)
ON_WM_SIZE()
ON_WM_CTLCOLOR()
ON_WM_ERASEBKGND()
ON_MESSAGE(MSG_SEARCHINFO,OnShowMemberInfo)
END_MESSAGE_MAP()
LRESULT CPageGroup::OnShowMemberInfo(WPARAM wParam, LPARAM lParam)
{
m_ctrlName.SetWindowText("kkkk");
return 1;
}