Need to disable finish button

[Sundaramoorthy]

I am having a requirement like where different subset of data got summarized in one column(fetching directly from DB) which are getting used in check box value prompt. When two alternate subset of data got selected in the check box value prompt,then need to display alert message for that wrong selection & disable finish prompt button..i have been trying to achieve this by using javascript..but not able to achieve this.Could you please show some light on this..

[BigChris]

No idea how to disable the Finish button, but as an alternative could you conditionally render a message to say that the selection is invalid?

[Sundaramoorthy]

Thanks you..Will work out on that alternate approach..