This is intriguing. I have done this before with appearance buttons (the appropriate edit fields become visible when the corresponding radio buitton is pushed), but havent attempted it with nib windows. In my program, there are edit fields for length, width, and height when the rectangular prism button is pushed. When the cylindrical prism button is pushed, the length & width edit fields disappear, and the radius field appears. Of course, the height field remains. Would this be done by having multiple windows, with the appropriate edit fields on each window? Or can just the fields appear and disappear? On Jan 27, 2010, at 12:05 AM, Brian S wrote: > (3) Let the user pick C to F or F to C via a radio button, then adjust all field labels to reflect the selection. The user should always type in the same edit field regardless of C to F or F to C.