title: setting background color of child window using window's handle
body: <p>I have defined and created a bunch of child windows in my main window using <code>handle_to_this_window[i] = CreateWindow(L"EDIT",...)</code>
  type of call.</p>
  
  <p>I now need to create a function that will allow me to set background color of any one of those windows.
  Something like:</p>
  
  <p><code>R_color_value = 0, G_color_value = 200, B_color_value = 0;</code>
  <code>ChangeChildBackgroundColor(handle_to_this_window[6], R_color_value, G_color_value, B_color_value);</code></p>
  
  <p><code>R_color_value = 200, G_color_value = 0, B_color_value = 0;</code>
  <code>ChangeChildBackgroundColor(handle_to_this_window[7], R_color_value, G_color_value, B_color_value);</code></p>
  
  <p>Could anyone point me in the right direction for how to achieve this, please?</p>