Seeking help for a weird idea

hi all,

I am trying to mimic handdrawing a chart by showing one candle at a time when I click it. Those already been clicked would remain active so that the chart looks continuous.

I set the backgroud to white so only the vague skeleton is visible on my chart. I guessI probably need SelectedValue function but don't know how to proceed as this has reached my coding limit.

Any help is appreciated.