How to set style for the label of custom control?

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Is there somewhere documentation what is supported and what not?

I found that using context.factory._customControlProperties.systemDefinedProperties.deviceSizeMode.Value would help me determine what layout I have to apply to my label/input if the size of the window changes.

However, I'l not sure it is supported.

Only other alternative I see is context.mode.allocatedWidth (and hardcode the width).

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Re: How to set style for the label of custom control?