Custom property at cell level for a datagrid vb.net

Question

Hi ,
Iam new to vb.net,
I need to create a property to datagrid at cell level
i.e
custom property "Border color" which is something similar to Back color
like
datagridview.rows(0).cells(1).Bordercolor
here Bordercolor should be my custom property
Please help me
Thanks in advance
rasna