Problem: After adding an attribute to a window the attribute is dispalys greyed out/readonly when clicking on test.
Solution: It would be worth checking that this is not a related attribute (an attribute which is linked to the object via a relationship in Object Designer). Related attributes are displayed on the window as read only. When the linked object is selected the related attributes are populated. For example when selecting the raise user the user telephone number is completed. The linking object is the user and the related attribute is there telephone number.