This event responds to the tree view Add command.
If the selected component has more than one type of
target that is allowed to be added then a list window is displayed
showing available target types.
If only one type is allowed then the component properties
form is displayed immediately.
Note the Component Properties form that is displayed uses the current
users assigned profile and default values.
Currently this form only displays the most primitive type of imput
controls (Text Boxes) and no signicant client side business logic
or validation is performed.