I am using version 2009.1 to create a XamWebGrid in my code behind.  I set the ItemSource to my datasource which is an Observable Collection.  All columns are ReadOnly except for the first column which is a checkbox.  The user can check or uncheck this - 

The problem is that checking or unchecking seems to be a 2 click process:  1 click to activate the cell & a second click to change the value.  How can I set this up so that the user only has to click once?

I have  the following settings:

this.ctl_ResultsWebGrid.EditingSettings.AllowEditing = Infragistics.Silverlight.EditingType.Row;

this.ctl_ResultsWebGrid.EditingSettings.IsEnterKeyEditingEnabled = true;

this.ctl_ResultsWebGrid.EditingSettings.IsOnCellActiveEditingEnabled = true;

this.ctl_ResultsWebGrid.EditingSettings.IsF2EditingEnabled = true;

this.ctl_ResultsWebGrid.EditingSettings.IsMouseActionEditingEnabled = Infragistics.Silverlight.MouseEditingAction.SingleClick;

this.ctl_ResultsWebGrid.EnterEditMode();