title: ExtJS 4 Ext.grid.Panel selection color
body: <p>I'm using ExtJs 4.1.3 and I have a simple grid (Ext.grid.Panel).
  I want to change the color of selected rows in that grid from default selection color to "red".
  I prefer do it in css file.
  I've already tried solution in other threads (for example <a href="https://stackoverflow.com/questions/3944139/how-to-change-extjs-grid-row-color">this</a>), but they don't work with extjs 4.</p>
  
  <p>This is how is rendered a selected row with extjs 4:
  <img src="https://i.stack.imgur.com/d3XSj.png" alt="desc">
  Could anyone help me?</p>