more details please..you really expect an answer with this question ?
sorry for late
and thanks for your reply
in designer the actors property take string seperate by commas for more than one actor
i need to change this property by making something like drop down list to choose from it the actors
which is better than write the actors
You can define and code your custom editors. Look at this example which also uses the Actors property .. so its very relevant: http://surdilovic.wordpress.com/2012/07/03/custom-input-editors-in-jbpm-designer/.
You will have to write you own code for the custom editor. We cannot help you w/ that
The asset customeditors does not exist in Guvnor's Global Area. I also tried to add manually but that didn't work either.