MemoBox line alpha related

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After adding line to memobox how to decrease its alpha?
I've tried this but not working.

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_MemoboxConstant.TextColour.A = 10;TextColour works for lable.

I was trying to decrease memobox alpha but by doing

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_MemoboxConstant.Alpha = 10The alpha of text remainms 255 or any which was specified during adding line.

Is there any method to do it?

For Spammers:
Don't tell me to use rgba colour while adding line.Rrad Read the topic before posting.

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Bump
Is there any solution. if not kindly tell me so i would stop waiting for solution.

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wait for replies

Seriously dafaq peoples do to increase their post counts.
If you don't know the solution stay out of topic.