InfoPath doesn't have a built-in Tab Control, but it's easy enough to build one using tables, buttons, and views, so let's do it!
- Views for the contents of each tab
- Table with shading to give the visual effect of tabs
- Buttons for each tab with a rule that switches the view
- Create all of your views (from the Views task pane)
- Select the same color scheme for each view (use the Color Schemes task pane)
- Use Background Color on the Format menu to make the background of each view the second color for the current color scheme (the second-darkest color at the top of the color picker)
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- Insert a layout table (on the Insert menu, click Table)
- Make it two rows high. The first row will be for the buttons, the second will be for the tab content.
- Split the first row to make a cell for each view, plus one extra cell to take the remaining horizontal space.
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- Insert a button into each cell (from the Controls task pane)
- Add a rule to each button to switch to the corresponding view. Do this even for the current view's button.
- Make the current "active" button Bold, so it stands out.
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- Use borders and shading (on the Format menu)
- Select all the buttons at once (hold down the Control key and click each one), then remove all borders and shading from the buttons (they're invisible except for their label!).
- Select the entire table, then add borders inside and out using the first color in the color scheme (the darkest color).
- Select the non-active cells and set their shading to the third lightest color of the color scheme.
- Select the active cell and the content cell, and set their shading to white.
- Select the active cell and remove the bottom border so it becomes connected to the content cell.
- Select the right-most "extra" cell and remove the top and right border
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- Copy the table to each view
- Update the borders and shading to change the "active" cell for each view
- Put all your fields for each tab in its content cell
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