Ω symbol in a text Label

Dear all,
I use Labwindows CVI, and would like to write the text « Ref= 50 Ω » on a label text but this does not work correctly. It seems to me that I cannot mix the symbol « Ω » with letters in the same text label. So, I write in different two text labels separatly the text « Ref= 50» and  the text « Ω ». The two text labels are  near each other, just to make them like they are written in a same text label. When the application is not resized, this seems to work fine.
However,  when I resize the panel application, the symbol « Ω » moves write the other text label. In the final, the two text labels become far away each from other, and they do not look like they are together.
I would like to know how can write « Ref= 50 Ω » in one text label, or how can I avoid the moving of text labels when the Panel is resized.
Thank you in advance for your answer.
Best regards,
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Hapiest