I would like to know how column fixing and column resizing behaviours can be implemented for webdatagrid with autogeneratedcolumns="true" ? when i activate the behavior of resizing the grid doesn't appears
In order to have column fixing and column resizing behaviors you have to set the width of the grid and to set the width of the columns.
When you have autogeneratedcolumns="true" you have to set the DefaultColumnWidth.
Here are links for column fixing and resizing behaviors: