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Gets the z-index of this control.
Use this property to retrieve the stacking position of the control relative to other controls on the worksheet. The returned value can change after calling BringToFront() or SendToBack().
int ZOrder { get; }
ReadOnly Property ZOrder As Integer
IControl control1 = worksheet.Controls.AddButton(20, 20, 120, 30);
IControl control2 = worksheet.Controls.AddButton(40, 40, 120, 30);
control2.BringToFront();
int zOrder = control2.ZOrder;