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    <p>Just to add a point or two to what @Xeo has already said:</p> <p>First of all, no, you don't <em>always</em> draw all the content yourself. During normal design phase you're basically just drawing something that looks like the control, but (at least IIRC) it also lets you "run" a form in test mode (certainly the VC++ dialog designer does, and even though VB's was more primitive, I think it did have that particular capability as well). Test mode was when you can "run" a form before you've (necessarily) attached any code to it -- even though clicking a button (for example) doesn't do anything in the surrounding program, the control itself works as normal -- a button clicks normally, an edit control will let you edit, etc.</p> <p>That is done by actually instantiating a control, telling it the correct position, size, and properties. ActiveX controls do quite a bit to support this, and the previous "Windows custom controls" did as well, though with considerably less sophistication. From the viewpoint of the control, it's working just about exactly like it normally would, receiving input, sending notification to its parent, etc. The only thing that's changed is that the parent most ignores most of the notifications it receives, but the control doesn't really know that.</p> <p>There are two basic ways to do this. One is to create a collection of controls yourself, along with their positions, sizes, etc., and use <code>CreateWindow</code> (or <code>CreateWindowEx</code>, etc.) to create window of the correct class. While relatively easy to handle, this has the disadvantage that it leaves all the tab-handling to you.</p> <p>The other possibility is to create a <code>DLGTEMPLATE</code> structure to hold data about the dialog box, and a some <code>DLGITEMTEMPLATES</code> for the individual controls, and finally use <code>CreateDialogIndirect</code> to create a dialog box with those specs, holding those controls. It's tedious, but it works, and when you're done it handles tabbing between controls automatically (and works the same as any other dialog, since it's the same Windows code creating it either way).</p> <p>Second, since you've tagged this C++, you might want to take a look at some <a href="http://www.codeproject.com/KB/miscctrl/diagrameditor.aspx" rel="nofollow">code</a> on CodeProject that actually implements a dialog editor. Although it isn't quite as sophisticated as some of the commercial ones, this is a <em>reasonably</em> complete form/dialog editor, complete with most of what you've asked about.</p>
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