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You may not need code at all.
I don't remember if they following properties where already available in forms6i.  
But check the current_record_visual_attribute_group in your forms properties and  in your block_properties.
For coding check the set_form_property or block_property build-in options
CURRENT_ROW_BACKGROUND_COLOR ,
CURRENT_ROW_FOREGROUND_COLOR
and other CURRENT_ROW options.
But for a consistent behaviour  you might use  a template form with visual attributes to use by reference in all your forms.
(maybe it's already there , but not with the colors you want)

you can add the following to the post-query block trigger:

SET_ITEM_INSTANCE_PROPERTY ('adv_order_progress.adv_action_out',CURRENT_RECORD, VISUAL_ATTRIBUTE , '<your_visual attribute>');

obvs...replace <your visual attribute> with your actual visual attribute you want to update...

hope this helps.

JT

Please describe exactly what you mean by this: "I want to select a row".  Does that mean:
1. You want to query just one row in an Oracle Forms database block?
or
2. After multiple records have been queried in a multi-record, Oracle Forms database block, you want to manually navigate (down arrow) to a particular record?
or
3. Something else?

Also, please tell us, is this an Oracle Forms question?  If yes, which version of Oracle Forms do you have?