closes #307 but needs testing first

src/client/js/main.js

@@ -57,8 +57,16 @@ define([
 			window.onfocus = this.onFocus.bind(this, true);
 			window.onblur = this.onFocus.bind(this, false);
 			$(window).on('contextmenu', function (e) {
-				e.preventDefault();
-				return false;
+				var allowedList = ['txtUsername', 'txtPassword'];
+				
+				var allowed = allowedList.some(function(item) {
+				    return e.target.hasClass(item);
+				});
+				
+				if(!allowed) {
+				    e.preventDefault();
+				    return false;
+			    }
 			});
 
 			objects.init();