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    <p>(I will assume that each form resides in its own unit.) First, you have to make sure that <code>idList</code> is accessible to other units. For example,</p> <pre><code>unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs; type TForm1 = class(TForm) private { Private declarations } idList: integer; public { Public declarations } end; </code></pre> <p>will not do, but</p> <pre><code>unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs; type TForm1 = class(TForm) private { Private declarations } public { Public declarations } idList: integer; end; </code></pre> <p>is OK. In such case, all you need to do in <code>Unit2</code> is to add <code>Unit1</code> to its 'uses list' (press Alt+F11, or use File/'Use Unit...', while in <code>Unit2</code> or while editing <code>Form2</code>). Then you can use <code>Form1.idList</code> to access the variable anywhere inside <code>Unit2</code>. (<code>Form1</code> is the global instance variable of <code>TForm1</code> in <code>Unit1</code>).</p> <p>For example,</p> <pre><code>unit Unit2; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls; type TForm2 = class(TForm) Button1: TButton; procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } end; var Form2: TForm2; implementation uses Unit1; // &lt;-- Add manually, or press Alt+F11 (or use File/'Use Unit...') {$R *.dfm} procedure TForm2.Button1Click(Sender: TObject); begin ShowMessage(IntToStr(Form1.idList)); end; end. </code></pre>
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    1. COOk I published variable, I had already add uses Unit1. But still that not working. I update my question about to code Unit1 and Unit3. Not working means Undeclared `identifier: "idList"`
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    2. CO@Dudi: Notice that my example uses `Form1.idList`, not `idList` alone...
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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.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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