Extensibility in SAP SRM User Interface - function CUSTOM_POST_EXIT

Hello All Experties,

I'm implementing BSP Appl. Page (JS) with the two functions : CUSTOM_PRE_EXIT and CUSTOM_POST_EXIT :

for example , I have expended the panel of Accounting using this syntex :

function CUSTOM_POST_EXIT (methodname, view, controller, methodSignature) {

    if (sap.ui.getCore().byId('accPanel') {

       sap.ui.getCore().setCollapsed(false);

    }

}

I have two questions :

1. how can I change the color of a textview field , for example 'itemType' Field ?

2. how can I run on a table (loop at table) and change attributes of columns ?

Regards,

Omri