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Gets or sets the horizontal text alignment of the button.
Not all values are supported by the *.ssjson format.
HorizontalAlignment HorizontalTextAlignment { get; set; }
Property HorizontalTextAlignment As HorizontalAlignment
IButton button = worksheet.Controls.AddButton(20, 20, 120, 24);
button.HorizontalTextAlignment = HorizontalAlignment.Center;
HorizontalAlignment alignment = button.HorizontalTextAlignment;