I have a button "add new " in my form, and there is a command action written (/_static/_common/scripts/RibbonActions.js) as per Ribbon workbench to create a new record.
Now i want to add my another function in as another command action which return true or false.
If it returns true then and then the default create function will execute.
How can i do this, anyone have idea ?
Try updating your New button command with following function from your script:
Hope it helps!