Question about default tab view item

If I have a tab view with 2 tabs, how would I go about displaying a particular tab by default when the window opens?

For example, this script doesn’t work, but it says what I want it to do:

if name of theObject is "help_button" then
		tell tab view "tab_view" of window "help_window" to display tab view item "help_rs_tab"
	end if


tell tab view "tab_view" of window "help_window" to set current tab view item to tab view item "help_rs_tab"