I am developing a simple c++ program inside Microsoft Visual Studio. This program will later be convert to DLL, in order to register it to Internet Explorer.

Inside my program, I would like to do like this:

 if flag=1,
   toolbar_button = green;
 else
   toolbar button = red;

I want to create a simple button on the Internet Explorer, and the button can reflects the color that I pass from my c++ program.

How can I achieve this?