Caption Properties Dialog
Lets you edit a caption's properties.

Time code value of the caption.
You can edit the time value manually or by using the small buttons below for seconds and milliseconds. You can set the playhead time by clicking on (If the Video Preview window is open, a seek operation is performed, which may not succeed; the exact time that can be seeked depends on the key frame time codes in the preview video).
Language Track
Caption text for the selected track will display below for editing.
Caption Text
Caption text for the selected language track can be edited here. Entering a newline is not recommended. Instead, you can use a <br> tag, since the player SWF will probably utilize HTML tags.
In the usual case that the player SWF displays the captions in HTML text fields, you can use the supported HTML tags (refer to Flash help for more information on the supported tags). Using the Anchor tag, it is possible to invoke an ActionScript function when the user clicks on the link. For example:
<a href='asfunction:someFunc, param'><b>Click Here</b></a>
Speaker for the caption.

Above: Caption properties dialog displayed as New Caption dialog.