set dialog pc fc bc oc th <numeric|n>
Sets color properties for dialog box widgets.
pc    prompt color fc    foreground text color bc    background color oc    outline color th    outline thickness n     numeric input only (optional) 
th is 1-5, a one-pixel border is drawn; if
it is 6 or more, a two-pixel border is drawn.
q dialog
refrence page for details on execution of the dialog box widgets.
set dialog 1 0 5 1 6 q dialog Hello World say result