title: How to draw lines between two buttons in vb.net?
body: <p>I have 9 buttons which are arranged in 3*3 matrix in vb.net.</p>
  
  <pre><code>btn1    btn2     btn3
  btn4    btn5     btn6
  btn7    btn8     btn9
  </code></pre>
  
  <p>Suppose, if I click on btn1 then move my mouse to btn2 then btn3 and at last click on btn6 then line should be drawn from btn1 to btn2 to btn3 to btn6.</p>
  
  <p>Like this:</p>
  
  <pre><code>btn1----btn2----btn3
                   |
  btn4    btn5    btn6
  
  btn7    btn8    btn9
  </code></pre>
  
  <p>Suppose, if i first click on btn6 then move my mouse to btn9 to btn8 to btn5 and last click on btn2 then line should be drawn this way:</p>
  
  <pre><code>btn1    btn2    btn3
  
  btn4    btn5    btn6
           |        |
  btn7    btn8----btn9
  </code></pre>
  
  <p>How to draw this kind of lines? 
  Any ideas?</p>