I'm using a TextBox to display fixed text to the user as the text is too long to fit in the available space and a TextBox seems the only way to have a scrollable text area.
TextBox is set to MultiLine and ReadOnly.
When the Text is changed in the designer and Apply is used to apply the changes to the runtime, the text does NOT change in the runtime: the runtime continues to display the old text, while the designer shows the new text.
Even after closing the designer and Megunolink the runtime continued to show the old text, but the designer showed the new text.
Workaround I found was to cut the TextBox (with Ctrl-X), click Apply, paste the text box back and Apply again.