System Console Dashboard examples?

hello, i also need some help here. Any system console dashboard example on key in some values to the textField widget and then printout that values onto another label widget?

Does anyone knows how to use this onChange command? I tried to the following scripts but myLed won't turn green?

namespace eval dashboard_example2 {

variable dash_path [ add_service dashboard dashboard_example "Dashboard" "Tools/Dashboard"]

dashboard_add $dash_path writeTextfield textField self

dashboard_add $dash_path myLed led self

dashboard_set_property $dash_path writeTextfield enabled true

dashboard_set_property $dash_path myLed color black

proc set_led_color { } {

dashboard_set_property $dash_path myLed color green

}

dashboard_set_property $dash_path writeTextfield onChange

[list ::dashboard_example::set_led_color]

}

Can anyone please help?

thanks