i want resize width of agdatagridcolumn in a agdatagrid with animation code : (CreateStb(agdatagrid)).Begin();//Exceptin: Cannot resolve TargetProperty Width on specified object. . . Private StoaryBoard CreateStb(UIElement element) { Storyboard stb = new Storyboard(); DoubleAnimation dbAnmtin = new DoubleAnimation(); Storyboard.SetTarget(dbAnmtin, (AgDataGridColumn)((AgDataGrid)element).Columns[0]); Storyboard.SetTargetProperty(dbAnmtin, new PropertyPath("Width")); dbAnmtin1.To=//custom value dbAnmtin1.Duration=//custom value stb.Children.Add(dbAnmtin); Return stb; } I think defining TargetProperty has a problem but I don’t know how to solve it . plz help me