title: How to validate a cq5 dropdown widget (xtype=selection & type=select) on text change?
body: <p>I have a drop down (xtype=selection &amp; type=select) in multi-field widget in cq5 dialog. I am populating the drop down dynamically using "options" property. I have also added "editable" property as true so that authors can type and choose a value from large number of list of values in drop down. Now the problem is, authors can type any value and save but i want to throw error as soon as the typed value does not match any value in the drop down and do not save the dialog. I am ok to change the widget type as long as my functionality is achieved. I can write a servlet to validate in the back-end. Can anyone help me with the correct event that i should use to achieve this? </p>
  
  <p>Note: 'selectionchanged' event does not satisfy my requirement. I need something like 'change' in textfield.</p>