title: Changing ttk widget text color
body: <p>I've searched all over, but have yet to find a simple example showing how to change a minor element of a ttk widget style and applying it dynamically (after widget creation).</p>
  
  <p>I have some ttk checkbuttons representing some configuration items, and a ttk button used to update a remote system.  The checkbuttons are initialized to the state of the remote system.</p>
  
  <p>If the user modifies any of the checkbuttons, I want both the checkbutton text and the update button text to become red, to remind the user that the checkbutton state no longer matches the remote state, and that the update button should be pressed to send the modified configuration to the remote system.</p>
  
  <p>When the update button is pressed, the text color of the update button and all checkbuttons reverts to black.</p>
  
  <p>I know this is possible (and is probably easy), but how?</p>
  
  <p>Edit: Modifying the background color would also be OK.</p>