自绘按钮打开一个程序时等待期间按钮属于什么状态

Question

自绘按钮继承至CButton，点击按钮打开一个程序，在程序加载等待期间（转圈圈），按钮出现空白未定义，程序出现界面后才恢复成nomal状态，当然，如果程序加载够快也是看不出来空白的，请问这是怎么回事？我也不知道该修改哪儿
//鼠标移动消息
void CSkinButton::OnMouseMove(UINT nFlags, CPoint point)
{
if (!m_bMouseTracking)
{
TRACKMOUSEEVENT tme = { 0 };
tme.cbSize = sizeof(TRACKMOUSEEVENT);
tme.dwFlags = TME_LEAVE | TME_HOVER;
tme.hwndTrack = m_hWnd;
_TrackMouseEvent(&tme);

    m_bMouseTracking = TRUE;
    m_bHover = TRUE;
    RedrawWindow(NULL,NULL,RDW_FRAME|RDW_INVALIDATE|RDW_ERASE|RDW_ERASENOW);
}


__super::OnMouseMove(nFlags, point);

}

//鼠标离开消息
LRESULT CSkinButton::OnMouseLeave(WPARAM wparam, LPARAM lparam)
{
m_bMouseTracking = FALSE;
m_bHover = FALSE;
RedrawWindow(NULL,NULL,RDW_FRAME|RDW_INVALIDATE|RDW_ERASE|RDW_ERASENOW);

return 0;

}

//鼠标按下消息
void CSkinButton::OnLButtonDown(UINT nFlags, CPoint point)
{

m_bPress = TRUE;
RedrawWindow(NULL,NULL,RDW_FRAME|RDW_INVALIDATE|RDW_ERASE|RDW_ERASENOW);

__super::OnLButtonDown(nFlags, point);

}

//鼠标抬起消息
void CSkinButton::OnLButtonUp(UINT nFlags, CPoint point)
{

if (m_bPress)
{

     m_bPress = FALSE;
     RedrawWindow(NULL,NULL,RDW_FRAME|RDW_INVALIDATE|RDW_ERASE|RDW_ERASENOW);

}


__super::OnLButtonUp(nFlags, point);

}

Answer 1

解决办法
头文件：
virtual void PreSubclassWindow();
定义：
void ClrButton::PreSubclassWindow()
{
ModifyStyle(0, BS_OWNERDRAW);

}