Forms :: How To Make Button Visible Property False By Clicking On It

I want to show or hide some items on my form by using the SET_ITEM_PROPERTY to enable or disable VISIBLE. i have a button NEW, my need is when i click on this NEW button it should be hide and some other items should be show. but when i click on this its only showing other items but not hiding the NEW button. my NEW button is like this:

[b]set_item_property('select.new',visible,property_false);
set_item_property('select.new',enabled,property_false);
set_item_property('select.new',navigable,property_false);[/b]
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set_item_property('control.section',visible,property_true);
set_item_property('control.section',enabled,property_true);
set_item_property('control.section',navigable,property_true);
set_item_property('control.year',visible,property_true);
set_item_property('control.year',enabled,property_true);
set_item_property('control.year',navigable,property_true);