how to remove items from list box

[#1]

runScriptFilter = Function( {filterWord},
	{},
	If( filterWord == "FE",
		selected = {"1", "2", "3"}
	);
	If( filterWord == "SSAFI",
		selected = {"4", "5", "6"}
	);
	If( filterWord == "BE",
		selected = {"7", "8", "9"}
	);
	Return( selected );
);

//title and gui
lub1 = Lineup Box( N Col( 3 ), spacing( 5 ),
	Spacer Box( size( 0, 0 ) ),
	Spacer Box( size( 0, 0 ) ),
	Spacer Box( size( 0, 0 ) ), 
	//button and text
	Button Box( "BE", b << append( runScriptFilter( "BE" ) ) ),
	Button Box( "SSAFI", b << append( runScriptFilter( "SSAFI" ) ) ),
	Button Box( "FE", b << append( runScriptFilter( "FE" ) ) ), 
	//H Center Box( text = Text Box( "Select column that will compared with indicators" ) ),
	b = List Box(),
	b << Set height( 400 );
	b << Set Width( 400 );
	
);
pb1 = Panel Box( "GM EOL", lub1 );
myWindow = New Window( "GM EOL", Show Menu( 0 ), show toolbars( 0 ), Border Box( Top( 20 ), Bottom( 20 ), Left( 20 ), Right( 20 ) ), pb1 );

I have a script which I simplified a little 

the append works great, but I want before appending a list, that it will clear the current state

clicking all the buttons gives me this:

but I actually want it to give me only 3 numbers and not 9 (the last button I clicked)

[#2 · Accepted solution]

You will have to clear b before appending to it (or rebuild it).

You could for example set it as empty before append:

Button Box( "BE", b << set items({}); b << append( runScriptFilter( "BE" ) ) ),

[#3]

Thanks that works great!
Tried with delete before and it like removed the whole box so i guess i just needed to set an empty list