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XAMDataGrid Set FieldSetting and Field LayoutSettings

HI All,

Hope someone can assist me. I have a XAMDataGrid and a Combobox on my form. The combobox has 2 items. What i want to do is set the following fields:

Combo Index 0 Selected:

1. FieldSettings - CellClickAction: EnterEditModeIfAllowed

2. FieldLayoutSettings - SelectionTypeCell: Single

Combo Index 1 Selected:

1. FieldSettings - CellClickAction: SelectCell

2. FieldLayoutSettings - SelectionTypeCell: ExtendedAutoDrag

When I set the value in code behind I get the following error: "Exception has been thrown by the target of an invocation." 

FieldSettings set = testGrid.FieldSettings;
FieldLayoutSettings lay = testGrid.FieldLayoutSettings;

if (matrixTuningComboBox.SelectedIndex == 1)
set.CellClickAction = CellClickAction.SelectCell;
lay.SelectionTypeCell = Infragistics.Windows.Controls.SelectionType.ExtendedAutoDrag;
set.CellClickAction = CellClickAction.EnterEditModeIfAllowed;
lay.SelectionTypeCell = Infragistics.Windows.Controls.SelectionType.Single;

testGrid.FieldSettings = set;
testGrid.FieldLayoutSettings = lay;

Please see the attachment.

Friendly Regards,