Reg: Making a field as required on selection

Hello Guru's, We are using Adobe Interactive Forms (NON PCR's) in WDJ application. I am having the below issue: My requirement is to make a field not required on selecting a value in the Dropdown. I could make that happen using the Java Script as below: InteractiveForm.SubForm.Fieldname.access = "readOnly" ; Fieldname.validate.nullTest = "disabled " ; This works fine. But in the application I have 2 other dropdowns, and on selection it is triggering the below line of code: ContainerFoundation_JS.SendMessageToContainer(event.target, "submit", "", "", "", ""); I have the same code to disable the field after this call. But instead of disabling it is Highlighting the field. I tried to see if there is any code where I am setting focus to that field, but no where in the code I am doing that. Please help me in fixing the issue. Thanks, Pramod