Hi group, I'm making a grid layer to overlap my polygon (each block), but i have problem to rendering the map canvas, 
i'm using a Child of JMapPane to drawing http://pastebin.com/dxSnu8nw  
and not works fine, my impression is that the panel does not finish drawing the map.
follows the image of the drawing, This is a first render working fine http://s9.postimage.org/lfum3iswv/geotools_imagem1.png ,
and this is a second grid create http://s11.postimage.org/6jz8zzsg3/geotools_image2.png
in this time don't have renderer all the map objects,
This error don't shows a exception trace in console, is possible identify him ?
Thanks, Jairo.