Microsoft Nav desktop expressionbuilder control I wonder how to get into

Has anyone worked with this control? ClrFullClassName is Microsoft.Dynamics.Framework.UI.WinForms.Controls.ExpressionBuilder. It is used on screen to filter a Microsoft DataGridView. If I could access this directly, I would. Otherwise I would love to know what control/property on the form that it drives so I could filter the DatGridView. I cannot find this control on the form. The developer is baffled by the question I am asking, though I will continue that route as well. It looks like