If you are wanting to resize just the width and/or height of the controls within a window (DataWindow Controls, Tab Controls, command buttons, etc.) then either the PFC Resize service or the stand-along objects based on the PFC mentioned in Sivaprakash's response can do the job nicely with a minimal amount of coding. The tech article I published (that Olan graciously referenced previously) and the accompanying sample app in CodeXchange should be very helpful in showing you the possibilities.
However, if you are wanting to resize the point size of the (text) information being displayed within a window as it is resized, that is another matter entirely. as that is a much more difficult problem. The PFC also has a DataWindow resize service that purportedly does this, but I've never used it and therefore cannot speak to its effectiveness.
Best regards, John