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    <p>You might hook the WM_Paint message and draw a rectangle on the ControlCanvas if required. One way to do this could look like this:</p> <pre><code>unit Edit_WithFrame_If_Needed_But_Empty; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls; type TEdit = Class(StdCtrls.TEdit) procedure WMPaint(var Message: TWMPaint); message WM_PAINT; procedure CMTextChanged(var Message: TMessage); message CM_TEXTCHANGED; procedure WMKEYUP(var Message: TWMPaint); message WM_KEYUP; private FPaintedRed: Boolean; FRequired: Boolean; procedure CheckForInvalidate; published public Property Required: Boolean read FRequired Write FRequired; End; TForm2 = class(TForm) Button1: TButton; Edit1: TEdit; Edit2: TEdit; Edit3: TEdit; procedure FormCreate(Sender: TObject); private { Private-Deklarationen } public { Public-Deklarationen } end; var Form2: TForm2; implementation {$R *.dfm} { TEdit } procedure TEdit.CheckForInvalidate; begin if Required and (Length(Trim(Text)) = 0) then begin if not FPaintedRed then Invalidate; end else if FPaintedRed then Invalidate; end; procedure TEdit.CMTextChanged(var Message: TMessage); begin inherited; CheckForInvalidate; end; procedure TEdit.WMKEYUP(var Message: TWMPaint); begin CheckForInvalidate; end; procedure TEdit.WMPaint(var Message: TWMPaint); var CC: TControlCanvas; begin inherited; if Required and (Length(Trim(Text)) = 0) then begin FPaintedRed := true; CC := TControlCanvas.Create; try CC.Control := Self; CC.Pen.Color := clRed; CC.Pen.Width := 3; CC.Rectangle(ClientRect); finally CC.Free; end; end else FPaintedRed := false; end; procedure TForm2.FormCreate(Sender: TObject); begin Edit1.Required := true; Edit3.Required := true; end; end. </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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