Thanks Mayank,I am using Adobe Experience Manager 6.5.0. Yes I see "cq-author-start-workflow start-workflow-activator” as Granite Class to invoke the workflow. I changed it to “js-editor-WorkflowStart-activator”, it fixed the above said issue.

Open any aem form or form fragment in edit mode and modify the form. select Page Information from the toolbar. The drop down menu has the option Start in Workflow. This should open a dialog where we can specify the required workflow. This dialog is not opening.. We have requirement of modifying the ...