Hello. We are having problems with the Infragistics.Win.UltraWinToolbars.UltraToolbarsManager.

Sometimes, when a combo from the toolbar is displayed and we click in another combo from the same toolbar the next exception appears:

Application_ThreadException: System.NullReferenceException: Referencia a objeto no establecida como instancia de un objeto. en Infragistics.Win.UltraWinToolbars.UltraToolbarsManager.OnEditor_AfterDropdown(Object sender, EventArgs e) en Infragistics.Win.EmbeddableEditorBase.OnAfterDropDown() en Infragistics.Win.EditorWithCombo.OnAfterDropDown() en Infragistics.Win.EmbeddableEditorBase.DropDown() en Infragistics.Win.EditorWithTextBaseDropDownButtonUIElement.OnMouseDown(MouseEventArgs e, Boolean adjustableArea, UIElement& captureMouseForElement) en Infragistics.Win.ControlUIElementBase.ProcessMouseDownHelper(Object sender, MouseEventArgs e) en Infragistics.Win.ControlUIElementBase.ProcessMouseDown(Object sender, MouseEventArgs e) en Infragistics.Win.Utilities.ProcessEvent(Control control, ProcessEvent eventToProcess, EventArgs e) en Infragistics.Win.UltraControlBase.OnMouseDown(MouseEventArgs e) en Infragistics.Win.UltraWinToolbars.UltraToolbarsDockArea.OnMouseDown(MouseEventArgs e) en System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks) en System.Windows.Forms.Control.WndProc(Message& m) en System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) en System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) en System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) en Infragistics.Win.UltraWinToolbars.UltraToolbarsManager.OnEditor_AfterDropdown(Object sender, EventArgs e) en Infragistics.Win.EmbeddableEditorBase.OnAfterDropDown() en Infragistics.Win.EditorWithCombo.OnAfterDropDown() en Infragistics.Win.EmbeddableEditorBase.DropDown() en Infragistics.Win.EditorWithTextBaseDropDownButtonUIElement.OnMouseDown(MouseEventArgs e, Boolean adjustableArea, UIElement& captureMouseForElement) en Infragistics.Win.ControlUIElementBase.ProcessMouseDownHelper(Object sender, MouseEventArgs e) en Infragistics.Win.ControlUIElementBase.ProcessMouseDown(Object sender, MouseEventArgs e) en Infragistics.Win.Utilities.ProcessEvent(Control control, ProcessEvent eventToProcess, EventArgs e) en Infragistics.Win.UltraControlBase.OnMouseDown(MouseEventArgs e) en Infragistics.Win.UltraWinToolbars.UltraToolbarsDockArea.OnMouseDown(MouseEventArgs e) en System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks) en System.Windows.Forms.Control.WndProc(Message& m) en System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) en System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) en System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

This occurs especially in old computers. What can we do to solve this problem?

Best regards and thank you.