c# - OxyPlot WPF - Get slected column -

i trying selected (clicked) column in oxyplot wpf. there way that? wpf code far:

    <oxy:plot x:name="plotdiagram" title="output" >         <oxy:plot.axes>             <oxy:categoryaxis itemssource="{binding item.bardisplaydata1}" labelfield="displaytext"/>             <oxy:linearaxis minimumpadding="0" absoluteminimum="0"/>         </oxy:plot.axes>         <oxy:plot.series>             <oxy:columnseries title="{binding item.title1}" fillcolor="green" isstacked="true" itemssource="{binding item.bardisplaydata1}" valuefield="value" />             <oxy:columnseries title="{binding item.title2}" fillcolor="red" isstacked="true" itemssource="{binding item.bardisplaydata2}" valuefield="value"/>             <oxy:columnseries title="{binding item.title3}" fillcolor="yellow" isstacked="true" itemssource="{binding item.bardisplaydata3}" valuefield="value"/>         </oxy:plot.series>     </oxy:plot> 

there no selected column property. need implement mousedown event on column series , determine column clicked using getnearestpoint() function.

void columns_mousedown(object sender, mousebuttoneventargs e)   {              var cols = sender columnseries;          oxymousedowneventargs args = converterextensions.tomousedowneventargs(e, sender);     if (cols != null)           {                   trackerhitresult nearestpoint = cols.getnearestpoint(args.position, false);                     if(nearestpoint != null) {             object selectedcolumn = nearestpoint.item;          }     } }