Thanks for the Weave tip Mark. And I completely agree with your comment re the controls - without them you automatically lose the associated flexibility. It was just a surprise seeing so many on what intuitively I expected to be a very simple shader. (Not that I can talk - you should see the plethora of controls and actions in my custom-built entomological recording database. About 150 on the main form alone, with almost every data field having a double-click action associated, and even some of the labels do too for lack of screen space at 640x480 when it was originally written! Imagine how many I could have now with 1600x1200 to play with...)