Hi,

I using the ColumnLayout object to display the link information like the follow chart:

But I find the problem when I click the [Invert Selection] button:

The first click the button, all rows could select or unselect by follow code:

           CustomSelection customSelection = new CustomSelection();
            for (int i = 0; i < this.m_MainGrid.Rows.Count; i++)
            {
                if (!this.m_MainGrid.Rows[i].IsSelected)
                {
                    customSelection.AddSelectItem(this.m_MainGrid.Rows[i]);
                }
            }

            this.m_MainGrid.SelectionSettings.SelectedRows.Clear();
            this.m_MainGrid.SelectionSettings.SelectedRows.AddRange(customSelection);

But when I click the [Invert Selection] button again, the problem happen:

The speed of traverse the XamGrid.Rows very slow(May be several minitues)!

I try to do not add the ColumnLayOut to the XamGrid, the problem not exist,

So I think the ColumnLayOut will be affect the speed.

I update my sample DemoTest.zip , please try it, thanks! The Infragistics version is 10.3.20103.2098

The operation step:

1 Click [Data Load] button, then data will be loaded.

2 Click [Invert Selection] button, then all row will be selected.

3 Click again [Invert Selection] button, then the page will be not responded.