title: python 3.x progressbar tkinter backwards?
body: <p>I am using python 3.4, tkinter and I want to use progrssbar to simulate a syringe, I mean the liquid inside of the syringe would be the progressbar</p>
  
  <p>normally this progressbar in tkinter python 3.4 goes in horizontal or vertical position, I want it vertical, I know that it start to fill the bar from the bottom to the top, which is right the syringe is getting liquid</p>
  
  <p>but my question is how can I put it backwards? I mean the progressbar instead of filling the syringe
  will be emptying the syringe </p>
  
  <p>I am using </p>
  
  <pre><code>BarVolVal_1 = ttk.Progressbar(mGui, orient='horizontal', length=100, mode='determinate')
  BarVolVal_1.place(x=80,y=80)
  BarVolVal_1.start(50)
  </code></pre>
  
  <p>help I just want to fill and empty the bar</p>