During style change, when we try to change the color to white from black(variant), it still remains Black.
Switching on/off a style does not affect already evaluated expressions. After switching the styles you have to re-evaluate the expression initializing the property (e.g. Color) or you recreate the corresponding GUI component. An automatic re-evaluation of expressions is not supported in case of the variants. May be this is the problem you observed? If yes, see also the section: Control the selection of dynamic variants.
In our use case, can you please explain how White(common property) multiplied by White(individual property) changes to Black?
This should not occur. Per default the color values are already #FFFFFFFF. If the problem is not explained by the above mentioned behavior of variants, we have to investigate the case. In such case, can you extract an example demonstrating this effect and upload it for analyze purpose?
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