HeaderMouseDown プロパティ

// The client event HeaderMouseDown takes two parameters sender and e
// sender  is the object which is raising the event
// e is the EventArgs

  var count = 0;

  function WDW1_HeaderMouseDown(sender, e) {

      var wdw = $find("WebDialogWindow1");
      
      //Gets reference to header
      var header = wdw.get_header();

      count++;

      //Sets the text that will be displayed in the caption area of the header
      header.setCaptionText("The number of times header clicked is  "+ count);

  }