What all cases? Windows (basic Win32 at that) provides a lot of controls like buttons, checkboxes, inputboxes, scrollbars, radiobuttons, comboboxes, listboxes, etc which do all their drawing themselves and you do not have any way to fully skin them (without hooking into undocumented stuff). Some controls allow for custom drawn elements but pretty much always that is just for the elements themselves, not the entire control.