[amibroker] param function

[Arthur Sawilejskij <arthur@xxxxxxxxxxxxxxx>]

I have a chart with 3 EMA's plotted - a 3 day and then a 9 and 21 day that 
I use in a simple MA crossover setup.

I plot buy/signals on the chart based on crossovers and want to use the 
param function to be able to simply alternate between the 9 and 21 EMA to 
see how it affects the plotted buy/sell signals.

I only want the two steps - 9 and 21 - so I have the line

pd = Param("pd", 9,9,21,12);

But when I click on the param window to move from the default 9 and expect 
it to go to 21 - it instead goes to 12 - and then when I click back - it 
goes to zero and the chart display naturally goes al strange.

I've obviously got something terrible wrong - any ideas?

Arthur


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