Space between two columns in datagrid header.

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C#

.NET

WPF

Silverlight

.NET4

, +

Hello,

In our current project we are using telerik rad controls for developing silverlight project,
according to logged-in user the columns are displayed on the datagrid, for some of the users some grid columns are set to invisible, which is leading to a gap between columns ,when the user is logged-in the space between the columns does not look good,
does any one know how to fix this gap, thank you very much.

<telerik:GridViewDataColumn DataMemberBinding="{Binding WeeklyUsage}"                                                                                
Width="84" 												DataFormatString="{}{0:F2}"                         						IsVisible="{Binding IsColumnVisibleToCustomer, Source={StaticResource PFOViewModel}}"
IsReadOnly="True" TextAlignment="Right" HeaderTextAlignment="Center"/>

public bool IsColumnVisibleToCustomer
        {
            get { return !WebContext.Current.User.IsInRole("Customer"); }
        }

public bool IsInRole(string role)
        {
            if ((this.Roles == null))
            {
                return false;
            }
            return global::System.Linq.Enumerable.Contains(this.Roles, role);
        }