The framework calls this member function when a child control is about to be drawn. Most controls send this message to their parent (usually a dialog box) to prepare the pDC for drawing the control using the correct colors.To change the text color, call the SetTextColor member function with the desired red, green, and blue (RGB) values. To change the background color of a single-line edit control, set the brush handle in both the CTLCOLOR_EDIT and CTLCOLOR_MSGBOX message codes, and call the CDC::SetBkColor function in response to the CTLCOLOR_EDIT code.OnCtlColor will not be called for the list box of a drop-down combo box because the drop-down list box is actually a child of the combo box and not a child of the window. To change the color of the drop-down list box, create a CComboBox with an override of OnCtlColor that checks for CTLCOLOR_LISTBOX in the nCtlColor parameter. In this handler, the SetBkColor member function must be used to set the background color for the text.Note This member function is called by the framework to allow your application to handle a Windows message. The parameters passed to your function reflect the parameters received by the framework when the message was received. If you call the base-class implementation of this function, that implementation will use the parameters originally passed with the message and not the parameters you supply to the function
可以根据控件类型返回不同的颜色刷子。
ON_WM_CTLCOLOR_REFLECT
添加函数afx_msg HBRUSH CtlColor ( CDC* pDC, UINT nCtlColor );
HBRUSH CMyComboBox::CtlColor(CDC* pDC, UINT nCtlColor)
{
nCtlColor=CTLCOLOR_LISTBOX;
SetBkColor(RGB(0,255,0));
HBRUSH b=CreateSolidBrush(RGB(0,255,0));
return b;
}
估计要实现这个功能得自己在CComboBox上继承出来个类自己实现画按钮的功能了。
http://www.codeproject.com/combobox/customcombo.asp自己下载吧