Acting when button down and button up in tcl/tk
<p>I want to detect when a button is pressed (down) but not released (up) in tcl/tk.</p>

<p>When you click a button, it's associated command is only executed after you let go and button goes back up.</p>

<blockquote>
  <p>From tcl/tk documentation:
  "<em>Command-Line Name: -command
  Database Name: command
  Database Class: Command
  Specifies a Tcl command to associate with the button. This command is typically invoked when mouse button 1 is released over the button window.</em>"</p>
</blockquote>

<p>Typically?</p>

<p>How does my command execute when a button is down?</p>