title: wpf textbox focus issue
body: <p>I have a control with several textbox controls on it.</p>
  
  <p>Now, when I press tab after I edit one of the textboxes, the focus is switched to the next textbox BUT I need to press an additional tab in order for it to enter the "editing" stage.</p>
  
  <p>The first tab simply draws a dotted background on the textbox ... and the second one actually puts the cursor position inside the textbox. Is there a way when I press tab, to automatically set the cursor inside the textbox?</p>
  
  <p>Thanks./</p>