I'm sure the solution is very simple but its frustrated me to the point where I'm willing to have the solution pointed out to me!
When I execute the following it works as expected except that it leaves swathes of whitespace between the text boxes as it appends to the v list box. Clearly it is modulated by the width - I have currently set them to the minimum to display each text box on a single row.
my_header = text box("A1234 ABC sdfsdfsdkfsd review plots, beta version, rev. 0:");
my_header << Set Font( "Verdana" );
my_header << Set Font Size( 18 );
my_header << Set Width( 725 );
my_text = text box("- The charts below show box plots of all non-XEW fthrnczard parameters by AB/YZ/Rtgncws/Tgdaqbu by time");
my_text << Set Font( "Times New Roman" );
my_text << Set Font Size( 13 );
my_text << Set Width( 737 );
my_VLB_Text = v list box();
my_VLB_Text << append (my_header);
my_VLB_Text << append (my_text);
my_Display_Win = New Window( "my_Window", my_VLB_Text);