question: private String processButtonCallout ( WButtonEditor button ) { GridField field = curTab . getField ( button . getColumnName ( ) ) ; return curTab . processCallout ( field ) ; }
target:  Process Callout(s). <p> The Callout is in the string of "class.method;class.method;" If there is no class name, i.e. only a method name, the class is regarded as CalloutSystem. The class needs to comply with the Interface Callout.