title: collapsable master detail gridview structure
body: <p>I need an advice for a c# asp.net project.
  My client wants to see some reports via the gridview object with master/detail structure.</p>
  
  <p>The main gridview will be full by all master data and each row will have a <strong>+</strong> icon (or button) on the first cells.
  When user clicks this icon, the all details data of that master row should be seen under that master row with collaps action.</p>
  
  <p>I can handle the database proccess but i can not figure out the collapsing part.
  How can i put some extra rows under the specific row on the gridview object?</p>
  
  <p>Thanks in advance..</p>