<p>Say I'm extending a TextBox called CustomTextBox in .net. In certain situations I would like to force a tab to the next TabIndex on the form. Is there a way to do this beyond getting all the controls contained in CustomTextBox's parent, sorting them by their TabIndex, and then focusing the next ordinal one?</p>

I think you are looking for something like the following method:
```
```
form1.SelectNextControl(textBox1, true, true, true, true);
```
```
(All the trues are just different options, read the intellisense!)
You did say it is WinForms and not WebForms right?