Detect Design Time in JavaFX -

is there way detect design time in javafx2 works in scenebuilder? similar with:

java.beans.beans.isdesigntime() 

for swing? developing custom control should displayed in scenebuilder. of codes in trigger classnotfoundexception. don't want add needed library, instead want bypass code trigger exception.

[update]

i'll tell going accomplish. extends input control components (textfield, combobox etc) , add propertyname attribute. created form extends panel scan input controls in , assign value them based on propertname. value taken pojo set form. use apache commons beanutls assign value input controls, need provide classpath bean utils jar.

if activate feature automatically, can't use form in scenebuilder. because form detect input control in , assignment need library. decided deactivate feature, , provide method programmer activate it. not want, guess have no choice.

there no such thing design time javafx controls.

instead control code needs follow couple of simple rules outlined in answer.

quoting mailing list thread custom controls in scenebuilder:

in scenebuilder 1.0 not yet possible add custom controls scenebuilder's library panel. possible load fxml contain custom controls. described in scenebuilder's user's guide - see section on custom type elements there:

http://docs.oracle.com/javafx/scenebuilder/1/user_guide/library-panel.htm

note being able load fxml containing custom element in scenebuilder, custom element must "well behaved".

1. it must not require special builder factory.
2. it must have public empty constructor.
3. if uses fxmlloader load nested fxml file, fxmlloader must configured use classloader custom component loaded (see https://forums.oracle.com/forums/thread.jspa?forumid=1385&threadid=2433150 gory details behind last requirement)

to answer additional points:

i don't want add needed library, instead want bypass code trigger exception.

the custom , unknown element types section of scenebuilder user guide states if don't provide path classes used custom controls, fxml still load in scenebuilder. if library supplied, scenebuilder provide functionality (scene builder should able render them in content panel , hierarchy panel).

my guess best support custom controls using recent 1.1+ build of scenebuilder rather 1.0 release of product.