By default the first cell of a row represents row indicator, which appears when the row is set as current.
To hide the row indicator set the RowIndicatorVisibility property to Collapsed.
<telerik:RadGridView x:Name="radGridView" RowIndicatorVisibility="Collapsed"> <!-- ... --> </telerik:RadGridView>
RadGridView allows you to easily customize each of the row types by just assigning a style to it.
To style rows or alternating rows you can use the RowStyle or the AlternateRowStyle properties. To learn how to do this take a look at the Styling Rows topic.
To style the group row you can use the GroupRowStyle property. To learn how to do this take a look at the Styling Group Row topic.
To style the header row you can use the HeaderRowStyle property. To learn how to do this take a look at the Styling Header Row topic.