Hi vali dan, Thank you for your efforts to contribute a solution to the problem you found. Unfortunately it is not that easy to implement. The parsing is only the first half; the continuous evaluation of the variable and the drawing is the other half. First of all: when can such an expression be specified? How can we determine wether we should use the constant "fill-color" or the expression "expr-fill-color"? Then we have to pass the expression "expr-fill-color" and probably also "expr-fill-color-alarm"...
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