Opacity
In several of the controls we can control the color via an expression, but the opacity uses a
slider so it cannot be controlled by expression. We would like to either be
able to use the ARGB function in the color expression or use a separate
expression if necessary to control the opacity of pie slices, bars, lines,
fields, columns, etc. This can be very useful to either highlight (or
"gray out") specific items on/in the chart / table / etc. It can also
be quite helpful in a Heat Map. We previously used the ARGB function for this
purpose frequently within QlikView.