For strings, specifically, there is a relatively easy way of doing this - if you right click the caption for any control, you can choose to rotate it. You can then change the caption using a property node (Caption.Text).
You can also write text in a picture control in different orientations.
For other controls, I think you can only really do this by using an invoke node to get an image of the control and then use a picture control to rotate and display that image.
BTW, rotated labels are usually very inconvenient for the user. If you have a space problem, you should consider using tabs instead.
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