Validates a special command (e.g. copy & paste).
function OnGUI()
{
var e:Event = Event.current;
if (e.type == EventType.ValidateCommand && e.commandName == "Paste")
{
Debug.Log("validate paste");
e.Use(); // without this line we won't get ExecuteCommand
}
if (e.type == EventType.ExecuteCommand && e.commandName == "Paste")
{
Debug.Log("Pasting: " + EditorGUIUtility.systemCopyBuffer);
}
}