Using the XML Editor
The Desktop Designer contains an XML editor for editing different markups. Here are some hits on built-in functions.
Start typing the opening token < for the tag and a popup will show which tags are available for use. Select a tag and hit enter to enter the tag into the code.
Note that this tag is still open and ready for adding properties before being closed.
It is recommended to hit the closing token > which will add the closing tag to always keep the tags closed so that the XML can be rendered correctly.
Place the cursor after the opening tag text and before the closing token and push space bar on your keyboard. This will bring a list of properties that are available for this tag. Select property and hit enter and enter the property value.