Flex PlotChart, Datatip position, showalldatatip

'm working on flex driven application show timeline of events. have set plotchart's showalldatatips property true, datatips visible. don't seem have access algorithm sets locations of datatips , draws line corresponding plotchart item. image below shows, algorithm seems want group datatips together, drawing them further away corresponding item, demonstrated points right , left of center point. center point demonstrating kind of placement want.

the algorithm place datatips in acceptable fashion when points close together, case, , want continue functioning in fashion

is there property can set tell try , place datatip close item possible without overlapping other datatips?

what have tried (without success):

• i tried overriding function move(x,y) on custom datatip class, did allow me move every datatip static amount in direction, did not contain information location of associated plotseries item, , did not re-draw line connects datatip item.
• i tried overriding function updatedisplaylist(width, height), had no effect on datatips rendered showalldatatips property instead of mouse_over event.

thanks in advance -kevin

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