Hi,

We were on a really old version of Infragistics (11.2) and we recently upgraded to 16.1.

In the latest version, we found that we are getting an exception with the following code:

private void ut_Click(object sender, EventArgs e)
{
UltraTree utControl = (UltraTree)sender;
if (utControl.ActiveCell == null) return;

switch (utControl.ActiveCell.Column.Key)
{
case "Checked":
utControl.ActiveCell.AllowEdit = AllowCellEdit.Full;
utControl.ActiveCell.BeginEdit();
if ((CheckState)utControl.ActiveCell.Value == CheckState.Unchecked || (CheckState)utControl.ActiveCell.Value == CheckState.Indeterminate)
utControl.ActiveCell.Value = (int)CheckState.Checked;
else if ((CheckState)utControl.ActiveCell.Value == CheckState.Checked)
utControl.ActiveCell.Value = (int)CheckState.Unchecked;

utControl.ActiveCell.EndEdit(false);
utControl.ActiveNode.Update();

Here's the stack trace:

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
at Infragistics.Win.UltraWinTree.UltraTreeNode.CommitCellValues()
at Infragistics.Win.UltraWinTree.UltraTreeNode.Update()
at OptiGlass.ctlOptimizer.ut_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at Infragistics.Win.UltraControlBase.OnClick(EventArgs e)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

I did a 

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
at Infragistics.Win.UltraWinTree.UltraTreeNode.CommitCellValues()
at Infragistics.Win.UltraWinTree.UltraTreeNode.Update()
at OptiGlass.ctlOptimizer.ut_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at Infragistics.Win.UltraControlBase.OnClick(EventArgs e)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Not sure if we're doing something that was OK in 11.2 but is no longer OK in 16.1 or if this is a bug, but I wasn't able to find any information on this.

Thanks in advance!

Steve