I think to create the effect that you want, you need to create a class based on a container. The container should have two text boxes added side-by-side. You then need to have logic in the Resize() event of the container to resize the text boxes as appropriate. Then add this custom container class to the column that you want to be multi-columned and set the currentcontrol source to the container. In the resize of the column, handle the resize of the container. You will need to add the sources then to the textboxes in the container.