1. Start with work area (File > New)  and use the illustration as a
reference:

2. Use the text tool to type a name (similar to what the illustration shows
below) and make sure you position it so you can add more the one button.

3. This is what I use (text/size/color)

// Make sure you always name your items. In this case the name of the button
name is is “button_name”

4. Now once you have decide what you want your button name to be  use the
line tool

(see illustration below) (you can choose any color you like, I used gray
#c0c0c0.)

// Make sure you always name your items. In this case the name of the line is
“line_1″

  

5. Once you have created the, position it according to the illustration below
(use the select tools).

Now you should have something similar  to the illustration below:

6. Converting these 2 items in a button is pretty simple.

Select both of the item (hold now Ctrl and point your mouse on each
items, once there selected click right  and select Grouping > Group as
Button)

use the illustration as a reference

If you did the grouping right, it should look somewhat like this:

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