edit timescale
xgantt=timescale=<command>
xgantt=timescale=<timescalename/index>=<command>
active=<timescale>  | 
activate timescale by name or index  | 
count  | 
return number of timescale  | 
firsttimescale  | 
firsttimescale-name in variable value  | 
nexttimescale  | 
next timescale-name in variable value  | 
<name> or <index>  | 
get timescale  | 
backgroundcolor=<long>  | 
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fontcolor=long  | 
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showcalendargrids=boolean  | 
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showdategrids=boolean  | 
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threedeffect=boolean  |