title: Remove left border grid line for WPF DataGrid header columns to match data grid lines
body: <p>The border styles for header cells and data cells in a WPF 4.0 DataGrid are inconsistent.. Header cells have a border that includes a left vertical border line and a right vertical border line around the header text. Data grid text column data lines are styled such that only the right side has a vertical border line. The following sample image illustrates this (note that the grid line color has been changed to #D0D0D0):</p>
  
  <p><img src="https://i.stack.imgur.com/8fAjH.png" alt="enter image description here"></p>
  
  <p>Here is the same image zoomed in to show the inconsistency:</p>
  
  <p><img src="https://i.stack.imgur.com/cwrcv.png" alt="enter image description here"></p>
  
  <p>How do you change the grid headers (perhaps via a templates or styles) to remove the left border, so that the header vertical border lines line up with the data border lines?</p>