get selected item from a List Box()

[#1]

I have a GUI where _cbFilters is poupulated in from different list. Once the List Box is populated, I want to select the variable and pass it for some other us. But unable to do that. I tried get text() get selected etc...e..

Button Box( "Get DataBase Filter Column",
						 _cbFilters  << Remove all; 
						Database_column_type = radio << getSelected;
						if(Database_column_type == "AN_CDS",
								 _cbFilters  << Append(Mongo_list) ,																									
								 _cbFilters  << Append(SQLColumnFilters_BootLogParsed))
						),
_cbFilters = List Box()
columnFilter = _cbFilters << get selected;_

[#2]

I'm running the simple code below and trying to get the selected item from List Box(). But it is giving me error saying:

Name Unresolved: SourceData in access or evaluation of 'SourceData' , SourceData/*###*/

x = {"abc", "cda"};
y={"123","345"};
selection = New Window( "Check",
	H List Box(
		Panel Box( "Select Database",
			radio = Radio Box( All_database_list, HideShowObject( radio ) ),
			Button Box( "Get DataBase Filter Column",
				_cbFilters << Remove all;
				Database_column_type = radio << getSelected;
				If( Database_column_type == "AN_CDS",
					_cbFilters << Append( x ),
					_cbFilters << Append( y )
				);
			),

		),
		FilterTxTBox = Text Box( "Columns: " ),
		_cbFilters  = List Box({" "},width(100),nlines(3),max selected( 1 )),
		Button Box("Done", SourceData = _cbFilters << GetSelected;),
		show(SourceData)
	),

);

[#3]

This approach is a bit simpler - I put actions directly into the radio box.

all_database_list = {"AN_CDS", "XYZ", "ABC"};

x = {"abc", "cda"};
y = {"123", "345"};
selection = New Window( "Check",
	H List Box(
		Panel Box( "Select Database",
			radio = Radio Box( All_database_list, 
				Database_column_type = radio << getSelected;
				If( Database_column_type == "AN_CDS",
					_cbFilters << set items( x ),
					_cbFilters << set items( y )
				);
			), 
		),
		FilterTxTBox = Text Box( "Columns: " ),
		_cbFilters = List Box( x, width( 100 ), nlines( 3 ), max selected( 1 ) ),
		Button Box( "Done", 
			SourceData = _cbFilters << GetSelected;
			Show( SourceData );
			selection << close window;
		),
	), 
);