Unable to figure out proper usage of ControlFX Dialogs option

Hi,

I have controlfx-8.0.5.jar in my library folder of my Netbeans project and hence

I have a package for org.controlfx.dialog inside the JAR.

How do I test these dialogs in my JavaFX application?

Here is the documentation I am referring to:

http://ift.tt/R8GsJw

I tried to grab the following piece of code from the above documentation and placed it inside

my try block and ended up seeing lot of errors as shown in the below: