Looking for the best approach to change the background color (and other properties) of the focused data entry control in a Delphi (VCL) application?
By (Windows) design, the control on a data entry form which has the input focus is not drawn (/highlighted) differently from other controls (i.e. those without the input focus). In case of the TEdit (or TMemo and alike) control, only the blinking insertion point is displayed.
To provide visually more attractive user-friendly interfaces for your Delphi applications, you could decide to change the background color (and maybe some other properties) of the currently selected control – the one that has the input focus. Of course, this would include restoring to the original background color when the focus shifts to another control.