Mapx 怎么改变polyline的颜色....另外哪位高手能在QQ知道...(10分)

如题
我的QQ 40787968

设置图元样式就行了
ftrstyle.LineColor:=RGB(255,0,0);

mapx1.Layers.Item['China Highways'].Editable:=true;
if mapx1.Layers.Item['China Highways'].Selection.Count>0 then

begin

t:=mapx1.Layers.Item['China Highways'].Selection.Item[1];
t.Style.LineColor:=micolorblack;
mapx1.Refresh;
showmessage('1');
end;


我给一个按钮这个函数,没有变化...我错了??求教...

mapx1.Layers.Item['China Highways'].Editable:=true;
if mapx1.Layers.Item['China Highways'].Selection.Count>0 then

begin

t:=mapx1.Layers.Item['China Highways'].Selection.Item[1];
t.Style.LineColor:=micolorblack;
t.update(emptyparam,emptyparam);
mapx1.Refresh;
showmessage('1');
end;

接受答案了.