Questions of Datagrid

[Axi]

How every one!
I have two questions about Datagrid web control:

1. How to get the column width of the datagrid by click the button in template column? I tried to use e.item.cells(2).width and datagrid1.columns(2).itemstyle.width on DataGrid1_ItemCommand event, but both of them can not work, how get it?

2. I make a button (CommandName="Select") in template column and want to select the row in datagrid by click this button, but it can not work. I change it to LinkButton, it can work. I change it to ImageButton, it can not work. Why? Does the selected command can not be supported by Button or ImageButton? It only can use LinkButton?

Thanks for help.